Found a 1968 sms penny with no S. Just like the dime. I have a SAN FRANCISCO penny to compare. It does however has a faded or polished mark but not where is supposed to be. If you look the penny with no mint mark has a better relief than THE SAN Francisco penny. I looked around but couldn't find one anywhere. Could I be wrong?
A) the error your thinking of is a 1968 PROOF dime with no S, there were no SMS coins minted in 1968. B) the 1968 S cent your comparing your coin to is not supposed to be a proof, it's a business strike. C) your 1968 cent is a business strike coin minted in Philadelphia, it's not a error.
Why is the relief way better on the coin with no S? The polish S I mentioned is on 4th photo, right below the year. Looks like a little circle but its am S . You can hardly see it on picture 1 but due to the shine of the coin is hard to see but next to a light source it got my attention.
Could it be a proof penny, You can see the relief is bett than THE SAN FRANCISCO mint and the letters are thicker better than THE SAN FRANCISCO mint. If it was a regular PHILADELPHIA coin wouldn't it be at a minimum worse than THE SAN FRANCISCO?
@CherryPicker1 is correct. Both of your coins are ordinary business strikes.
SMS production ended in 1967, and all 1968 proofs were struck in San Francisco. Strike quality depends on many factors, one of which is die state. Worn dies produce coins with less detail than new dies. That is most of the difference you are seeing in the coins.
The OPs coin is a business strike cent: If it were missing the 'S' mint mark it would have to be this shiny to be a proof cent. (no SMS that year as already mentioned)
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