http://pastingtable.com/rare-unused/
Rare Unused
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| RARE FULL UNUSED ORIGINAL 1909 Chicago Cubs SEASON TICKET BOOK 25 MINT UNUSED | |
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$14,900.00 End Date: Sunday May-20-2012 13:15:39 PDT Bid now | Add to watch list |
| Unused 1938 SNOW WHITE 7 DWARFS GAME Pre WWII Made In USA Rare WALT DISNEY New | |
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$13,949.89 End Date: Saturday Jun-9-2012 11:01:10 PDT Buy It Now for only: $13,949.89 Buy It Now | Add to watch list |
| 1895 Vintage Baseball Unused Full Ticket Graded PSA 6 Omaha Omahogs Rare | |
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$9,999.99 End Date: Monday May-28-2012 20:21:26 PDT Buy It Now for only: $9,999.99 Buy It Now | Add to watch list |
| 16 TYPE 4 UNUSED EXT RARE CV 1600000 LD7 | |
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$8,500.00 End Date: Sunday Jun-10-2012 8:03:02 PDT Buy It Now for only: $8,500.00 Buy It Now | Add to watch list |
| 70b Unused VF GEM WITH PFC VERY RARE Cat 625000 | |
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$4,900.00 End Date: Friday May-25-2012 11:04:28 PDT Buy It Now for only: $4,900.00 Buy It Now | Add to watch list |
| 70b STEEL BLUE UNUSED VF APP W PSAG CERT EXTREMELY RARE CV 625000 LD173 | |
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$3,699.00 End Date: Sunday Jun-3-2012 21:32:01 PDT Buy It Now for only: $3,699.00 Buy It Now | Add to watch list |
| Japanese transformers G1 D 311 MASTERFORCE BLACK ZARAK MIB UNUSED RARE | |
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$3,699.99 End Date: Tuesday Jun-5-2012 9:06:47 PDT Buy It Now for only: $3,699.99 Buy It Now | Add to watch list |
| RARE SOVIET OLYMPIADE 100 AUTHENTIC UNUSED OLYMPIC GAMES 1980 MOSCOW TORCH | |
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$3,599.99 End Date: Thursday Jun-7-2012 1:03:41 PDT Buy It Now for only: $3,599.99 Buy It Now | Add to watch list |
| 67 Unused no gum XF APP W PFC RARE Cat 950000 | |
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$3,250.00 End Date: Thursday May-31-2012 7:21:58 PDT Buy It Now for only: $3,250.00 Buy It Now | Add to watch list |
| US Stamps 21 1c Franklin XF Unused Fresh With Sheet Margin Rare Type II w PFC | |
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$3,275.00 End Date: Monday May-28-2012 19:03:04 PDT Bid now | Add to watch list |
| Nikon F2 with DE 1 Prism Chrome NEW IN BOX UNUSED RARE | |
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$3,150.00 End Date: Tuesday May-22-2012 12:12:24 PDT Buy It Now for only: $3,150.00 Buy It Now | Add to watch list |
| 67 RARE SOUND UNUSED STAMP GEM Cat 1150000 | |
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$2,995.00 End Date: Friday Jun-1-2012 12:14:35 PDT Buy It Now for only: $2,995.00 Buy It Now | Add to watch list |
| OLD USA STAMP 1862 UNUSED 2 CRISP GUM RARE ISSUE HIGH VALUE LOOK | |
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$2,800.00 End Date: Wednesday May-23-2012 11:00:31 PDT Buy It Now for only: $3,400.00 Buy It Now | Bid now | Add to watch list |
| 68a RARE HORIZ STRIP OF 5 UNUSED SOUND F VF+ Cat 625000 | |
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$2,499.00 End Date: Saturday May-19-2012 8:41:11 PDT Buy It Now for only: $2,499.00 Buy It Now | Add to watch list |
| Rare 1930s Marklin SK800 Train Set BOXED Unused Pre War | |
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$2,500.00 End Date: Friday Jun-15-2012 7:22:20 PDT Buy It Now for only: $2,500.00 Buy It Now | Add to watch list |
| 20LU156 1867 BOYS CITY DESPATCH UNUSED EXTREMELY RARE HV772 | |
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$2,500.00 End Date: Tuesday May-22-2012 9:37:54 PDT Buy It Now for only: $2,500.00 Buy It Now | Add to watch list |
| U S O94 Unused FVF SCV600000 Rare | |
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$2,495.00 End Date: Friday Jun-15-2012 20:21:42 PDT Buy It Now for only: $2,495.00 Buy It Now | Add to watch list |
| 8A RARE VF XF UNUSED GEM TYPE IIIa | |
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$2,250.00 End Date: Wednesday Jun-6-2012 11:37:23 PDT Buy It Now for only: $2,250.00 Buy It Now | Add to watch list |
| 62B VF UNUSED RARE CV 325000 WL167 | |
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$2,250.00 End Date: Saturday Jun-16-2012 3:22:07 PDT Buy It Now for only: $2,250.00 Buy It Now | Add to watch list |
| 62a UNUSED 1861 90 DULL BLUE PAR OG W PF CERT EXTREMELY RARE CV 2750 LD172 | |
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$2,250.00 End Date: Sunday Jun-3-2012 21:29:35 PDT Buy It Now for only: $2,250.00 Buy It Now | Add to watch list |
| China Taiwan 1895 Tiger 2nd Print Set 3 Unused RARE | |
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$2,000.00 End Date: Tuesday Jun-5-2012 23:03:56 PDT Buy It Now for only: $2,000.00 Buy It Now | Add to watch list |
| GI Joe Cobra Viper Glider w Viper Pilot Hasbro 1983 MIB unused RARE | |
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$1,995.00 End Date: Monday May-21-2012 15:46:49 PDT Buy It Now for only: $1,995.00 Buy It Now | Add to watch list |
| NIKON F3P 35MM SLR BODY+MD4 MOTOR DRIVE MINT UNUSED CONDITION RARE OPPORTUNITY | |
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$1,936.36 End Date: Saturday Jun-2-2012 15:15:16 PDT Buy It Now for only: $1,936.36 Buy It Now | Add to watch list |
| RARE 11 23 1963 IOWA NOTRE DAME FOOTBALL UNUSED MINT TICKET JFK KILLED NO GAME | |
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$1,995.00 End Date: Tuesday Jun-12-2012 18:00:27 PDT Buy It Now for only: $1,995.00 Buy It Now | Add to watch list |
| BARNEY Coloring Book VERY RARE HARD TO FIND IN NEW UNUSED CONDITION NEAR MINT | |
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$2,000.00 End Date: Tuesday Jun-12-2012 19:24:09 PDT Buy It Now for only: $2,000.00 Buy It Now | Add to watch list |
| 70b Unused Regummed over thin Cat 650000 RARE B | |
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$1,895.00 End Date: Thursday May-24-2012 11:21:17 PDT Buy It Now for only: $1,895.00 Buy It Now | Add to watch list |
| 14 Unused XF GEM HUGE MARGINS RARE B | |
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$1,799.00 End Date: Sunday May-20-2012 11:47:41 PDT Buy It Now for only: $1,799.00 Buy It Now | Add to watch list |
| Gorham Pewter Rare 1977 Kambara Pattern UNUSED 38 Piece | |
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$1,799.99 End Date: Saturday May-19-2012 13:20:30 PDT Buy It Now for only: $1,799.99 Buy It Now | Add to watch list |
| PHILS 403a RIZAL IMPERF VERT ON A STR 5 UNUSED GEM RARE ERROR CV 1950 HV262 | |
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$1,750.00 End Date: Friday Jun-1-2012 10:00:31 PDT Buy It Now for only: $1,750.00 Buy It Now | Add to watch list |
| 122 Unused 90c LINCOLN RARE Cat 500000 HSD | |
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$1,699.00 End Date: Sunday May-27-2012 10:18:55 PDT Buy It Now for only: $1,699.00 Buy It Now | Add to watch list |
| 31 Unused VERY RARE DESIRABLE Cat 1000000 B | |
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$1,699.00 End Date: Tuesday Jun-12-2012 13:27:34 PDT Buy It Now for only: $1,699.00 Buy It Now | Add to watch list |
| US 2 Unused App Tiny tear inclusion at bott RARE B | |
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$1,599.00 End Date: Sunday May-27-2012 10:07:35 PDT Buy It Now for only: $1,599.00 Buy It Now | Add to watch list |
| RARE UNUSED IDEAL RIDE A CYCLE Toy Motorcycle Pedal Car Ride On OLD STORE STOCK | |
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$1,500.00 End Date: Wednesday May-23-2012 16:53:50 PDT Buy It Now for only: $1,500.00 Buy It Now | Add to watch list |
| 9 Var Unused RARE POSITION 7R1L XF GEM | |
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$1,500.00 End Date: Tuesday May-29-2012 11:49:25 PDT Buy It Now for only: $1,500.00 Buy It Now | Add to watch list |
| WV9 RARE SANITARY FAIR UNUSED CIVIL WAR ISSUE | |
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$1,500.00 End Date: Tuesday Jun-5-2012 12:21:34 PDT Buy It Now for only: $1,500.00 Buy It Now | Add to watch list |
| 118 Unused 15c RARE TYPE I F VF SOUND Cat 425000 | |
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$1,500.00 End Date: Tuesday Jun-12-2012 8:46:59 PDT Buy It Now for only: $1,500.00 Buy It Now | Add to watch list |
| 1932 Xth OLYMPICS STADIUM OPENING CEREMONY UNUSED FULL TICKETS LOS ANGELES RARE | |
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$1,499.95 End Date: Wednesday May-30-2012 17:41:18 PDT Buy It Now for only: $1,499.95 Buy It Now | Add to watch list |
| U S 85B Unused FVF SCV675000 Rare | |
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$1,499.00 End Date: Tuesday May-22-2012 17:42:21 PDT Buy It Now for only: $1,499.00 Buy It Now | Add to watch list |
| Scott LOX2c Post Office Seal Unused Stamp RARE ITEM | |
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$1,500.00 End Date: Thursday May-24-2012 11:02:12 PDT Buy It Now for only: $1,500.00 Buy It Now | Add to watch list |
| Japanese Transformers Victory Deathsaurus D 336 MIB UNUSED RARE | |
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$1,499.99 End Date: Tuesday Jun-12-2012 8:40:49 PDT Buy It Now for only: $1,499.99 Buy It Now | Add to watch list |
| 491 XF UNUSED GEM NO GUM RARE CV 250000 LD127 | |
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$1,475.00 End Date: Sunday Jun-3-2012 14:43:11 PDT Buy It Now for only: $1,475.00 Buy It Now | Add to watch list |
| E4 Unused RARE BLOCK OF 4 VF XF Cat 375000 A BEAUTY | |
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$1,450.00 End Date: Friday May-25-2012 8:38:28 PDT Buy It Now for only: $1,450.00 Buy It Now | Add to watch list |
| 17 Unused 12c XF APPEARANCE WITH PFC RARE STAMP B | |
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$1,400.00 End Date: Sunday May-20-2012 12:34:53 PDT Buy It Now for only: $1,400.00 Buy It Now | Add to watch list |
| 15 Var XF UNUSED W PRE PRINT PAPER FOLD ERROR RARE B | |
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$1,399.00 End Date: Monday May-21-2012 9:06:00 PDT Buy It Now for only: $1,399.00 Buy It Now | Add to watch list |
| RE164 Unused WINE BLOCK VF RARE GEM Cat 150000 | |
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$1,399.00 End Date: Wednesday May-23-2012 12:26:55 PDT Buy It Now for only: $1,399.00 Buy It Now | Add to watch list |
| 1840 Spooner No 13 Caricature Fine Unused Rare | |
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$1,343.60 End Date: Thursday May-24-2012 11:10:16 PDT Buy It Now for only: $1,343.60 Buy It Now | Add to watch list |
| 85B Unused Z GRILL RARE SOUND at 425000 | |
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$1,300.00 End Date: Monday Jun-11-2012 12:08:30 PDT Buy It Now for only: $1,300.00 Buy It Now | Add to watch list |
| O113 Unused RARE OFFICIAL VF XF GEM Cat 200000 | |
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$1,299.00 End Date: Monday Jun-11-2012 12:01:04 PDT Buy It Now for only: $1,299.00 Buy It Now | Add to watch list |
| 7 VAR POS23L2 RARE HUGE CRACKED PLATE VAR UNUSED HV192 | |
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$1,300.00 End Date: Friday May-25-2012 10:49:04 PDT Buy It Now for only: $1,300.00 Buy It Now | Add to watch list |
| US PR28 Unused VFXF SCV175000 RARE BEAUTY W PFC | |
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$1,299.99 End Date: Monday Jun-11-2012 18:35:20 PDT Buy It Now for only: $1,299.99 Buy It Now | Add to watch list |
| BMW R51 3 MOTORCYCLE CRANKSHAFT WITH CONECTING RODS NEW UNUSED ORIGINAL RARE OEM | |
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$1,199.00 End Date: Tuesday May-22-2012 6:27:20 PDT Buy It Now for only: $1,199.00 Buy It Now | Add to watch list |
| 85B Unused no gum SOUND RARE Z GRILL Cat 6750 | |
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$1,200.00 End Date: Thursday May-31-2012 13:24:23 PDT Buy It Now for only: $1,200.00 Buy It Now | Add to watch list |
| HURST OLDS 1983 1984 OEM Hood SCOOP Rail UNUSED Original RARE | |
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$1,200.00 End Date: Monday Jun-4-2012 13:21:05 PDT Buy It Now for only: $1,200.00 Buy It Now | Add to watch list |
| momen US Stamps 515b unused Pair PF Cert RARE | |
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$1,195.00 End Date: Tuesday Jun-12-2012 14:58:47 PDT Buy It Now for only: $1,195.00 Buy It Now | Add to watch list |
| Hardy Salmon Perfect 3 3 4 w New Unused Hardy Cardboard Box Rare Collectable | |
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$1,149.00 End Date: Saturday Jun-16-2012 11:06:44 PDT Buy It Now for only: $1,149.00 Buy It Now | Add to watch list |
| 72 Unused 90c VF GEM WITH PFC Cat 150000 RARE | |
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$1,150.00 End Date: Wednesday May-30-2012 12:50:31 PDT Buy It Now for only: $1,150.00 Buy It Now | Add to watch list |
| 44 Unused 1875 RE ISSUE F VF App RARE Cat 325000 | |
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$1,099.00 End Date: Monday May-28-2012 12:37:00 PDT Buy It Now for only: $1,099.00 Buy It Now | Add to watch list |
| US U33 10 green on buff unused rare PSE cert | |
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$1,050.00 End Date: Wednesday May-23-2012 10:18:34 PDT Buy It Now for only: $1,050.00 Buy It Now | Add to watch list |
| PR108 XF UNUSED GEM RARE W PSE CERT | |
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$1,000.00 End Date: Thursday Jun-7-2012 9:28:48 PDT Buy It Now for only: $1,000.00 Buy It Now | Add to watch list |
| HAWAII R11 Unused FULL VF SHEET OF 50 RARE | |
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$995.00 End Date: Saturday May-26-2012 9:08:35 PDT Buy It Now for only: $995.00 Buy It Now | Add to watch list |
| 17 Unused F VF GEM VERY RARE Cat 240000 | |
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$995.00 End Date: Sunday Jun-3-2012 13:55:27 PDT Buy It Now for only: $995.00 Buy It Now | Add to watch list |
| NIB Rare Faberge Odessa Crystal Hock Wine Glasses Mint Unused Condition Set of 6 | |
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$979.00 End Date: Friday May-25-2012 16:49:03 PDT Buy It Now for only: $979.00 Buy It Now | Add to watch list |
| RS17a UNUSED DS BARNES 4 VERMILION MEDICINE STAMP RARE 24 EXIST HV540 | |
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$995.00 End Date: Sunday Jun-3-2012 20:26:26 PDT Buy It Now for only: $995.00 Buy It Now | Add to watch list |
| VTG Disston Select D 95 8 Point Crosscut Handsaw 26 Rare NOS MIB NEW Unused MIP | |
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$999.99 End Date: Thursday May-24-2012 20:17:52 PDT Buy It Now for only: $999.99 Buy It Now | Add to watch list |
| NFLD 75 VERTICAL PAIR w 77 w CERT UNUSED RARE | |
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$995.00 End Date: Sunday Jun-10-2012 14:27:55 PDT Buy It Now for only: $995.00 Buy It Now | Add to watch list |
| RARE Coil of 1937 3d SG 467 unused deep violet inc leader Inc 480 stamps type S | |
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$948.42 End Date: Saturday May-19-2012 12:10:41 PDT Buy It Now for only: $1,343.60 Buy It Now | Bid now | Add to watch list |
| 138 Unused 7c VF GEM APP RARE Cat 180000 | |
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$950.00 End Date: Monday May-21-2012 11:06:14 PDT Buy It Now for only: $950.00 Buy It Now | Add to watch list |
| 13 Unused 10c Small faults RARE Cat 775000 | |
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$950.00 End Date: Thursday Jun-7-2012 9:29:58 PDT Buy It Now for only: $950.00 Buy It Now | Add to watch list |
| UNIQUE Large Woven Rug RUNNER Antique RARE Circa 1850s Bulgarian UNUSED | |
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$790.00 End Date: Sunday May-27-2012 0:23:20 PDT Buy It Now for only: $790.00 Buy It Now | Add to watch list |
| RARE unused ORIGINAL 70s true vintage PUMA sneakers TE KU size 9 ADIDAS german | |
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$890.00 End Date: Friday Jun-15-2012 12:13:58 PDT Buy It Now for only: $890.00 Buy It Now | Add to watch list |
| Toys McCoy Indiana Jones Arabian Horse MIMB 12 Action Figure UNUSED RARE | |
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$899.99 End Date: Friday Jun-1-2012 8:05:00 PDT Buy It Now for only: $899.99 Buy It Now | Add to watch list |
| Alfex 1982 925 Silver Hand Wind Pocket Watch Rare New Unused | |
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$839.99 End Date: Monday Jun-11-2012 21:18:03 PDT Buy It Now for only: $839.99 Buy It Now | Add to watch list |
| SAN DIEGO CHARGERS 1987 GAME UN USED GARY ANDERSON JERSEY Vintage Throwback RARE | |
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$859.99 End Date: Tuesday May-29-2012 14:43:51 PDT Buy It Now for only: $859.99 Buy It Now | Add to watch list |
| UNIQUE Large Woven Rug RUNNER Antique RARE Circa 1800s Bulgarian UNUSED | |
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$790.00 End Date: Sunday May-27-2012 0:23:15 PDT Buy It Now for only: $790.00 Buy It Now | Add to watch list |
| 85 UNUSED WITH CERT RARE CV 215000 HV968 | |
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$850.00 End Date: Monday Jun-11-2012 18:57:32 PDT Buy It Now for only: $850.00 Buy It Now | Add to watch list |
| 18 Unused no gum VF XF GEM FROM PLATE 12 RARE | |
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$850.00 End Date: Wednesday May-23-2012 8:38:49 PDT Buy It Now for only: $850.00 Buy It Now | Add to watch list |
| VERY RARE WHEATLEY 100 YEAR ANNIVERSARY FLY BOX UNUSED | |
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$790.33 End Date: Sunday May-27-2012 9:55:51 PDT Buy It Now for only: $790.33 Buy It Now | Add to watch list |
| Heman Vintage Top Toys HE MAN figure unused MOC w unpainted armor RARE | |
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$799.99 End Date: Saturday Jun-16-2012 18:45:06 PDT Buy It Now for only: $799.99 Buy It Now | Add to watch list |
| 362 3 CENTS BLUISH PAPER VF UNUSED RG RARE HV1062 | |
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$799.00 End Date: Saturday May-26-2012 5:13:56 PDT Buy It Now for only: $799.00 Buy It Now | Add to watch list |
| R135a 2 WASHINGTON INVERTED CENTER UNUSED VF UNLISTED RARE BN206 | |
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$799.00 End Date: Thursday Jun-14-2012 19:12:07 PDT Buy It Now for only: $799.00 Buy It Now | Add to watch list |
| O82 Unused XF GEM STRIP OF 3 RARE MULTIPLE | |
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$799.00 End Date: Monday Jun-11-2012 10:57:59 PDT Buy It Now for only: $799.00 Buy It Now | Add to watch list |
| 39 Unused VF App regum PSE CERT RARE STAMP | |
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$799.00 End Date: Monday Jun-11-2012 15:08:17 PDT Buy It Now for only: $799.00 Buy It Now | Add to watch list |
| Fender Rare 90s 4 Guitar Aluminum Flight Case XXX Cond Unused | |
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$695.00 End Date: Sunday May-27-2012 15:50:34 PDT Buy It Now for only: $695.00 Buy It Now | Add to watch list |
| GARCIA MITCHELL 840 FISHING SPINNING REEL NEW IN BOX UNUSED NOS MINT RARE | |
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$734.87 End Date: Wednesday May-23-2012 2:43:07 PDT Buy It Now for only: $734.87 Buy It Now | Add to watch list |
| GARCIA MITCHELL 840 MATCH FISHING SPINNING REEL NEW IN BOX UNUSED NOS MINT RARE | |
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$734.87 End Date: Wednesday May-23-2012 3:44:33 PDT Buy It Now for only: $734.87 Buy It Now | Add to watch list |
| 77 VF UNUSED W APS CERT RARE CV 1750 BM4483 | |
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$750.00 End Date: Sunday May-20-2012 8:56:10 PDT Buy It Now for only: $750.00 Buy It Now | Add to watch list |
| R33a Var VF+ Unused CRACKED PLATE Var PSAG CERT RARE | |
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$750.00 End Date: Monday Jun-11-2012 9:58:40 PDT Buy It Now for only: $750.00 Buy It Now | Add to watch list |
| 166 Unused 90c F VF GEM RARE | |
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$749.00 End Date: Saturday May-19-2012 12:21:25 PDT Buy It Now for only: $749.00 Buy It Now | Add to watch list |
| 25 Unused VF GEM SOUND RARE Cat 115000 | |
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$749.00 End Date: Monday Jun-11-2012 10:44:08 PDT Buy It Now for only: $749.00 Buy It Now | Add to watch list |
| 92 Unused 1c F GRILL RARE STAMP | |
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$749.00 End Date: Monday Jun-11-2012 13:53:25 PDT Buy It Now for only: $749.00 Buy It Now | Add to watch list |
| BMW E9 Coupe 28CS to 30CSL Electric Rear View Mirrors NEW UNUSED VERY RARE | |
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$699.00 End Date: Wednesday May-23-2012 19:08:47 PDT Bid now | Add to watch list |
| RE156 Unused WINE BLOCK VF RARE GEM Cat 80000 | |
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$725.00 End Date: Wednesday May-23-2012 12:26:55 PDT Buy It Now for only: $725.00 Buy It Now | Add to watch list |
| 73 Unused BLOCK OF 4 SOUND RARE Cat 400000 | |
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$725.00 End Date: Wednesday Jun-13-2012 13:30:40 PDT Buy It Now for only: $725.00 Buy It Now | Add to watch list |
| 98 Unused 15c FINE SOUND RARE F GRILL | |
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$725.00 End Date: Wednesday Jun-13-2012 15:44:34 PDT Buy It Now for only: $725.00 Buy It Now | Add to watch list |
| Edo Antique UNUSED RARE Hyakunin ishu Cards R310 | |
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$680.00 End Date: Thursday May-24-2012 0:01:48 PDT Buy It Now for only: $680.00 Buy It Now | Add to watch list |
| USA Scott 40 1ct blue Reprint XF Unused RARE | |
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$699.00 End Date: Friday Jun-15-2012 18:08:20 PDT Buy It Now for only: $699.00 Buy It Now | Add to watch list |
| HOT TOYS 1 6 12 BLADE 2 II ACTION FIGURE BRAND NEW + UNUSED IN UK RARE | |
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$648.09 End Date: Sunday May-20-2012 10:35:06 PDT Bid now | Add to watch list |
| 20 Unused VF+ A SOUND RARE GEM | |
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$695.00 End Date: Sunday Jun-10-2012 12:11:50 PDT Buy It Now for only: $695.00 Buy It Now | Add to watch list |
| 90 Unused SOUND RARE STAMP Cat 220000 | |
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$689.00 End Date: Thursday May-24-2012 9:04:02 PDT Buy It Now for only: $689.00 Buy It Now | Add to watch list |
| 90 Unused regummed 12c RARE STAMP Cat 220000 | |
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$679.00 End Date: Friday Jun-15-2012 13:38:10 PDT Buy It Now for only: $679.00 Buy It Now | Add to watch list |
Efficiency of Solar Cells
The silicon solar cell has been around for more than half a century, and during that time it has made significant steps in terms of efficiency. Bell Labs released the first silicon solar cell on April 25, 1954. It had an efficiency of about 6%, meaning that it converted about 6% of the sun’s energy it experienced to electricity.
This was a massive improvement over the selenium solar cell, which had been the standard before the invention of the silicon solar cell. Selenium solar cells produced at only about 0.5% efficiency.
Most research on solar cells since that time has focused mainly on increasing efficiency and decreasing manufacturing costs. So far, researchers have succeeded in creating cells with up to 40% efficiency, using exotic materials. These materials add a lot to the manufacturing cost of cells as well, though; these high-performance cells can cost over 100 times as much as standard 8% efficient cells to produce. Production cost is possibly the greatest obstacle to solar power becoming more popular.
Under ideal conditions, the sun can deliver around 1,000 watts of power per square meter. A solar cell’s advertised performance is based on this figure. Dust, pollution, elevation, temperature, weather and other variables can have an effect on sunlight intensity. Volcanic eruptions and other events can reduce sunlight around the world for over a year. Low elevation also has a detrimental effect on solar cell efficiency. At higher elevation, the air is thinner, and there isn’t as much dust and pollution between the sun and the solar cells.
At present, multicrystalline solar cells work at approximately 14-19% efficiency. However, this kind of cell is not expected to progress much beyond that point. Much of the current research being done involves amorphous silicon cells, which currently operate at about 8% efficiency.
Even without any massive improvements in solar cell efficiency, the goal of replacing fossil fuel-based energy generation with solar power is within reach. A little over 10,000 square miles of space would have to be dedicated to solar panels in order to supply all of the electricity currently produced in the United States. Even now, there is enough unused desert in the US to meet this benchmark.
In order to have power even when the sun isn’t out, solar power systems need to involve some form of power storage as well. Many power companies are considering “smart grid” systems involving the use of battery banks to solve this issue. Batteries could also represent a solution to the problem of elastic demand presented by hot days.
Solar cell efficiency has increased substantially, from 0.5% to as high as 40%, since solar cells first emerged. Although the efficiency of commercially available solar cells is not considered likely to increase significantly in the short term, solar cell prices continue to fall.
If you want to install your own solar power system, you must think about the kind of roof panel that you are going to utilize. If you are interested to know more about roof solar panels, go to Roof Solar Panels.
If you are interested in building your own solar panel, check out these step-by-step guides Build Solar Panel and GreenDIY Energy Review.