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Coin terms and glossary entries beginning with O.
What is the Obverse of a Coin?
What are is the obverse of a coin? Your Guide has the definition to this and other coin related terms in the glossary of coin terminology. The obverse side is defined on this page.
OPM Defined - What is an Overpunched Mintmark?
Overpunched mintmark (OPM or OMM) is defined on this coin terms glossary page.

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