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This section is designed to help those how want to learn about variety coins. It will help the beginner better understand the difference between an error coin and a variety coin. These pages will also help the experienced E/V collector understand the fine details of this interesting part of the numismatic hobby. Variety Coins What is a Doubled Die? What is Mechanical Doubling? What is a RPM, OMM? What is a RPD, MPD, OD? Top of Page