Learn: No mintmark is nothing special. It means it - along with 754,109,999 of it's BFFs - was minted in Philadelphia. It also has 1,774,020,400 close warm personal friends minted in Denver with a D mintmark.
No US Cent minted in Philadelphia has ever had a mint mark except during 2017 to celebrate the 225th anniversary of the mint's founding.
The P mintmark was added to other coins in 1980. Prior to that the Philadelphia coins were not marked.
-----Burton
49 year / Life
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, OnLine Coin Club
Owned by four cats and a wife of 39 years (joined 1983)
PS:
ANA's records are messed up, they show me as a 50-year member and I'm now Emeritus