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Hello timmyster! 1989 was the last year the mint hand punched mint marks into the dies, here's the RPM info from our Glossary:
Re-punched Mint Mark: On Lincoln cent business strikes, the mint marks were punched by hand into the Working dies up through 1989, and on proof coinage until 1985. Sometimes a punch contacted the die more than once; sometimes purposefully due to the first punching being unsatisfactory, or sometimes accidentally due to the punch bouncing or skipping during the initial hit. If subsequent hits by the punch did not line up exactly with previous punchings, a secondary mint mark would be created on the die and all the coins it struck. Most of these re-punchings were just slightly rotated from the first, and can be identified by noting split serifs. Many publications call these “tilted” rpms, but “rotated” might be a better term, since a punch could also be tilted on an angle of incidence into the die.
I'm not sure what you have here and don't want to guess. One of our experts will chime in soon!
Thank ya'll and I assume that mechanical doubling a less important type of doubling than in a manual one?
Yes, mechanical doubling is simply the die bouncing or sliding while the coin is minted. A doubled die is the product of the actual die being doubled, so it creates coins that are exactly the same and attributable to that particular die....the only difference will be wear as the die is used.
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