1990 no S penny
Hello all,
I need some help. I have several 1990 pennies without the mint mark. Now, I do know that there are Philadelphia without the mint marking.
My question is to 4 particular coins (the ones shown above the rest)..
Any help is appreciated!

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Comments
They appear to be standard business strikes.
Paper money eventually returns to its intrinsic value. Zero. Voltaire. Ebay coinbowlllc
how to differentiate a proof vs a shiny no proof?
The 1990 no S cent is a proof... I'm not seeing a proof.
thanks
“My question is to 4 particular coins (the ones shown above the rest)..
Any help is appreciated!”
Philly cents that have not seen much circulation and not received much contact.
But...
Not sure what’s on the paper towel the cents are on, but, it should speed up toning/corrosion overnight.
Proofs are known by the strike characteristics...design definition, flat rims etc. Though the pictures do not show detail due to their small size, they do not appear to be proof coins. Cheers, RickO
Proofs have a mirror like finish in the fields. The coins you picture are just ordinary circulation strikes. Proof coins are sometimes seen in circulation because so many of the proof sets from the past 50 years are extremely common and have little demand. The sets are being broken up and pieces with the lowest value and least demand, such as cents, are just being dumped back into circulation.
Proof sets from the early 70s are dirt cheap. Buy yourself one as a comparison.
@Calradix when @291fifth says "mirror like", he doesn't mean "sort of like". He means that they ARE mirrors. If you can't hold the coin perpendicular to a newspaper and -- literally -- read the newspaper in the reflection in the coin, then you don't have a mirror.