
As others have mentioned the 1990 'No S' are a Proof coin. They were struck at San Francisco on special dies with double plated zinc planchets. They look like this:


At the Philadelphia Mint they struck 1990 business strike cents for normal coinage. (6,851,765,000) They do not have the proof surfaces. That is what you have. Note the finish on your coin. It is not mirror like a proof coin. Yours is a BU Cent from Philadelphia.
Edited by coop
01/20/2017 10:22 am