I've been learning a lot about error coins from threads here and after seeing some examples of planchet errors I think I have one on a 1917 liberty walking half. It's really old + in poor condition, but I'd be curious if I accurately spotted the error or if it was just hit with something heavy in its nearly 100 year lifetime.

It's located by the L and isn't really noticable from the reverse. It's very noticable from the side though.