Wondering if anyone knows what this might be and if its worth rehandling and sharpening up? I've never sharpened or rehandled an axe so i thought this might be fun (found it at the thrift store), but don't really want to spend time and money on it if its a crappy axe. Only marking I can find is "U.S.A. 3-1/2". It looked really really similar to a photo someone posted of a vintage collins axe head. Your help is appreciated!