I don't see anything out of the ordinary, a 1979 P that I have looks identical.... If it is counterfiet, I would love to meet the guy that counterfiets a penny with 6 billion copies out there......
The one-cent coins don't carry a P mint mark for Philidelphia..... even up to current production. Nickels and up started receiving P mint marks in 1980.
All coins now carry a mintmark except the cent from Philadelphia. Very high grade examples carry a premium. Modern coins pulled from circulation do not carry numismatic value.