Roosevelt 1980-P mint stamp

[Conan62]

I read that Roosevelt dimes minted in Philadelphia between 1980 and 1984 all have the same MMS-001 mint mark. My comparison show this 1980-P dime mint mark is much smaller than my 1984-P but I don’t understand why. Almost looks like a dot. No detail. Am I misinformed about the mint marks or is this simply normal variations and size?

[occnumis2021]

the answer you seek is in your very image. the first image clearly shows striking variance in the bottom 1/4 of the coin, this 1/4 includes the mm, thus....

you'll notice the 2nd image does not.

[Conan62]

”Striking variance” affected the mint mark, got it! I just added striking variance to my list of research topics. Thank you very much for taking a look and responding.

[occnumis2021]

”Striking variance” affected the mint mark, got it! I just added striking variance to my list of research topics. Thank you very much for taking a look and responding.

it may not be a good search term. i just use it to cover a broad selection of what may have happened to the flan prior to or during striking.

the odds are low but if the dime (the first one) has also an odd lower reverse, there is a chance it could be an error.

[MintErrors]

I read that Roosevelt dimes minted in Philadelphia between 1980 and 1984 all have the same MMS-001 mint mark. My comparison show this 1980-P dime mint mark is much smaller than my 1984-P but I don’t understand why. Almost looks like a dot. No detail. Am I misinformed about the mint marks or is this simply normal variations and size?

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In my opinion, when assessing these coins, it's important to look at the overall coin to see if something else may have caused this issue. Look at the words, In God We Trust. There might have been something in that area that caused the die to shift slightly, IF it was strike related.

Roosevelt's chin shows more evidence, it looks like that area received some damage from the strike. If the motto area was a strike through the damage to the chin, date and mint mark would be possible.

If it was done after the mint, it could have been affected/damaged by a coin roller machine. With circulated coins, they reach ultimately reach people who can do odd things to coins. If it's coin counter damage, it could have been assisted with handling and normal wear and tear, circulation wise.

But this kinda looks like a minor strike through. It could very well be just a highly used working die (Late or Very Late Die Stage) , near end of its service life. Nothing stay perfect after striking hundreds of thousands of coins. Both coins have the same basic look near IGWT.