Categories
Bonded Coins
Broadstrikes
Brockages
Counterbrockages
Die Adjustment Strikes
Die Caps
Die Trials
Double Denomination
Double/Multiple Strikes
Dual Countries
Dual Mint Marks
Edge Lettering Block
Essay Trial Strikes
Experimental Blanks
Experimental Strikes
Experimental Surface
Feeder Finger Strikes
Foreign Coins Struck
on U.S. Planchets
Galvanos
Gold Die Trials
Gold Errors
Gold Off-Metals
Hub Trials
Indents
Intentional Errors
Martha Washington
Test Pieces
Mated Pairs
Missing Clad Layer
Mules
Multiple Errors
Off-Centers
Off-Metals
Overstrikes
Pattern Die Trials
Pattern Errors
Pattern Mules
Plaster Models
Platinum Errors
Proof Errors
SMS Mint Errors
Specimens
Spectacular Errors
Struck Scrap
Struck Thru
Transitional Errors
Two-Headed Coins
Two-Tailed Coins
Uncancelled Dies
Uniface Die Trials
Unique Coins
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Proof Errors
Proof coins are struck by technicians who hand feed the blanks into special presses. They are produced, examined and packaged using extreme quality control. It is very unusual to find major proof errors. A few broadstrikes, off-centers, double strikes (in collar) and off-metals have been known to be found in sealed proof sets. Proof errors are aggressively sought after by many error collectors.
This proof Bicentennial Dollar major mint error is unique in many ways and has no equals. It is the only known double struck with the second strike off-center. There are no off-centers known, no off-metals known, no mated pairs known, and no double denominations known. |
