middle coin on the top row is a 1943 P
War Nickel. You can BARELY make out the mint mark in person. cannot make it out on the photo. Someone else just posted one on the nickel CRH forum and then I find this one the day after. The other finder said they cannot make out a mint mark AT ALL. Mine pictured below is barely legible.
I am thinking it is
Struck Through Grease. not much else it could be in my mind unless the die was very worn.
