1990 Penny With A Really Big S With No Mint Mark

to the CCF

Cool counterstamp.

Nice coin.

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Welcome to the Forum. You've come to a phenomenal place to share and learn.

Yes. A counter stamped LSC. If you visit the link in my signature line you'll see that there is a whole world of counter stamped IHCs, LMCs and LSCs. Thanks and again welcome.

To CCF! Nice counterstamp.

Go to Amazon and search "metal stamp"

Main use of these is craftwork and putting IDs on metal objects.
Sometimes someone is board and will use it on a piece of scrap metal (coin) as a test

to the CCF

No mintmark = Philadelphia, as the original mint, they only used the P mintmark for the War Nickels (1942-1945) to show they were 35% silver.

And then in 1979 with the Susan B. Anthony dollars followed by all regular coins 1980 and later from the nickel up.

The 2017 Lincoln Cent is the only Lincoln Cent with a P mintmark to commemorate the 225th anniversary of the founding of the mint.

Now if you want to chat about American Silver Eagle Bullion coins (ASEs), yes, there are a bunch of shenanigans with the P mintmark there.