The type of the receiving coin, upon which another set of dies are struck, is referred to as "undertype", while the type being struck over it is called an "overtype". (Source)

Am I understanding correctly?:

  • "undertype" is the original coin.
  • "overtype" is the original coin which counterstruck by another set of dies.
  • This is technical language, and its meaning is not clear to me as a native English speaker. I can guess what it means, but it uses words outside their normal meanings.
    – Colin Fine
    Aug 29 '18 at 10:18
  • Please tell me what do you guess.
    – user64617
    Aug 29 '18 at 10:22
  • 1
    I didn't put my guess, because Helen had already given a comprehensive answer.
    – Colin Fine
    Aug 29 '18 at 10:28

I think you are right according to this book:

Counter-striking is the phenomenon of coins issued by one authority being re-struck by another authority. Numismatists refer to the original strike of counter-struck coins as the 'undertype' and the new one as the 'overtype'. When properly done, re-striking can completely erase the original undertype.

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