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About U.S. Coin Varieties


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RPM-Repunched Mint Marks

OMM-Over Mint Marks

Doubled Dies

Rotated Reverses


Repunched Dates

MPD-Misplaced Dates

Clash Dies

The NCADD (The National Collectors Association of Die Doubling) is providing collectors an "Educational Series" every month. This is great info from a highly recognized national coin club. I will be posting a link to there "Educational Series" every month.

"Educational Series on Die Doubling" #1: Mechanical Doubling Damage vs. Hub Doubling

"Educational Series on Die Doubling" #2: Die Deterioration Doubling (DDD) vs. Hub Doubling