That is my primary thinking but there isn't any damage to it, most chemicals are going to damage the finish
Thats what I thought as well, but its so uniformly distributed that it made me wonder.
I was going through my box of pennies looking for errors as I normally do. I stumbled across a 1978 Penny that caught my eye. It looked like...
Reverse
Obverse
compared with a polished cent
close up
obverse
Separate names with a comma.
