There are error coins like the that. Some of them have particular value.Interesting. I was just in my son's room looking at his mason jar of coins & bills when I noticed a nickel that looked to be in great shape. I fished it out and it was a 1951.
You seem coin smart, didn't they re-stamp some 1941 pennies to 1942? I think I remember there being a few that are rare and you can still read the 1941 as well as '42. Not sure, I just know that I like them.