Lincoln Cent Machine Doubling, or Overpunched Mint Marks (OMM)?

[PennyMike]

I have four 1969 S Lincoln pennies with odd looking mint marks. Are these all machine doubling errors, or possibly OMMs? Thanks!

S20210128_0001.jpg S20210128_0001.jpg S20210128_0001.jpg S20210122_0002.jpg

[mustbebob]

They are all MD (machine Doubling) as you suspected.

For your information, OMM stands for Over Mint Marks meaning the mintmark from one mint was punched over the mintmark from another Mint (such as D over S.

[PennyMike]

Thanks Bob! I have one more that is a little different from those previous 4.

It is a 1951 S, and I found a similar one on VarietyVista.com. What are your thoughts about this one?
Possible OMM?

Thanks,
Mike


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[mustbebob]

These are not the same die. The mint mark position is different and should be the first thing you check to verify. Your example is also pretty well circulated. You would need a better example to see the notching and/or separation lines.

In the future, we would appreciate a different post for each coin you want looked at. It helps to keep confusion down as to which coins are in each post. Thanls!

[PennyMike]

Thanks Bob. I am a greenhorn to this and did not realize the intent was to compare to a matching die impression. I was focused on the mint mark only.
I learned a lot so thank you, and I will limit to one coin per post going forward.