You ask about a 1974 but show a 1972. Anyway, it would be at the lower left on Lincoln's shoulder, just above the rim. It is often very faint or even invisible if weakly struck or the die is worn.
Easiest to see if you tilt the coin on circulated pieces. Can sometimes see straight on if mint state BU. Frequently struck through grease and partially or totally missing.
Hi,since the you showing 1972 penny 68 penny to and the 1965 now 65 missing two letter out of the word Liberty look for your self tell me what you think is wrong with it.