Before 1979, except during WWll 1941-1945, the Philadelphia mint did not put it's mint mark on any denomination of coins. 1941-1945 the mint mark on the nickel was on the reverse above the building including the Philadelphia mint. From 1979 - 2016 all denominations except the Penny, coming from the Philadephia has the "P" on it. In, I believe, 2009, a limited amount of Penny's bore the "P", which I have yet to see one. I'm not sure how many Penny's were minted with it but I do know it was very low.
Edited by Tootallious
09/17/2017 02:37 am