I also have a 1961 with a hidden 5 in the neck tie,5 on the chin, and a 5 and a 9 above liberty. Could on see neck tie 5 by holding a light from 6 o'clock to 9 o'clock. Any other angle with light could not see. Also some kind of rim errorbottom left and right 1985 penny
I can see your pictures now. Unfortunately, your coin is showing severe zinc rot, from the copper plating getting pierced, causing the zinc core to get exposed. It's a form of Post Strike Damage ( PSD), meaning that the damage happened after it left the U.S. Mint (after the strike).