What's Up With The MM On This 1991-S Lincoln Proof Cent?

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Author	Replies: 5 / Views: 1,068
tolch123 Valued Member United States 116 Posts	Posted 04/12/2020 12:40 pm What's up with the MM on this 1991-S Lincoln Proof Cent? Report this Post to the Staff

QuarterHoarder72 Pillar of the Community United States 2156 Posts	Posted 04/12/2020 12:45 pm Looks like MD or DDD below the mint mark, and maybe a plating bubble next to it? Report this Post to the Staff
Onedollarbillnut Pillar of the Community United States 745 Posts	Posted 04/12/2020 1:58 pm Plating blister Tim Hughes Report this Post to the Staff
tolch123 Valued Member United States 116 Posts	Posted 04/12/2020 2:13 pm Can you explain what that is? I've never heard this term. When I'm getting a big head about all I know, I always need to come here to have my ego pummeled. Report this Post to the Staff
Yokozuna Pillar of the Community United States 4618 Posts	Posted 04/12/2020 4:32 pm tolch123 asked... Quote: Can you explain what that is? I've never heard this term. It's common to see bubbles, blisters and liner plating blisters on zinc plated Lincoln cents. It's usually caused by zinc dust on the planchet allowing the copper plating to lift after the coin has been struck. Some coins have one or two blisters and some have lots. It's not an error because it's not something that happens after the coin is struck. ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!! Edited by Yokozuna 04/12/2020 4:34 pm Report this Post to the Staff
tolch123 Valued Member United States 116 Posts	Posted 04/12/2020 8:07 pm Super helpful! Thank you for the insight! Report this Post to the Staff
	Replies: 5 / Views: 1,068

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