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CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error and variety specialties, including doubled dies, Repunched mintmarks, multiple errors, clips, double strikes, off-metals and off-centers—just to name a few. In addition to its website, CONECA publishes an educational journal, The Errorscope, which is printed and mailed to members bimonthly. CONECA offers a lending library, examination, listing and attribution services; it holds annual meetings at major conventions (referred to as Errorama) around the country.

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1979D Lincoln Cent - RPM or not?

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  • #16
    Sorry, Bob, but I'm still a bit confused. If the mint mark on such coins were punched by hand how is it possible that the mint mark doubling is caused by mechanical doubling, which is done by machine, right? I thought everything, except the mint mark, on coins until 1990 was done by machine so how does the mint mark get involved in the mechanical doubling? Thanks for the info about; "Normally, if there is doubling on both the mintmark and date (prior to 1990) this would indicate mechanical doubling versus a hub doubled die or RPM. Of course there are exceptions." I was not aware of this fact so at least I did learn something. Thank you Bob! Fran

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    • #17
      Fran,
      I can see where it is you are getting confused at. When we mention the mintmark being punched by hand, we are talking about it being punched into the die....not the coin itself. It is punched during the hubbing process. Once the die has been hubbed, it goes into the machines to begin striking coins. It is at this time (during the striking process) when the mechanical doubling occurs. Had the doubling happened during the punching into the die...it is considered a repunched mintmark (RPM).
      I hope you understand what I am trying to say here as I am attempting to make it read as easy as possible. Some of the knowledgeable folks may not like the terminology I am using, but I am sure they know what I mean.
      Bob Piazza
      Lincoln Cent Attributer

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      • #18
        Yes... that clarification did indeed help. Thanks again, Bob, for sharing your time and your knowledge. Fran

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