I would guess environmentsl damage on all four, but 3 all have resembled, in a different way , missing clad layer or struck on wrong planchet nickels. New to this coun stuff, glad this site is here.Sorry if pictures aren't great.
Hello and welcome to CoinTalk Looking at your Nickels I can tell that the 3 Jeffersons have Environmental Damage to the surface. Sorry but none are Mint Errors. Also.. Nickels do not have Clad Layers such as Quarters and Dimes have with a copper core.