It looks like a post war refinish - from th eParkerising - but someone has changed the grips, they woudl probably have been the black plastic ones if you want to make it look lik eit was last reworked then I woudl find a bad cut down and swap them over. The original wood grips coudl be used as well, again grab them off a M1icon cut down. The blade and markigns look right, and nothing like any of the repro's I've seen. Try US Military Knives Bayonets Machetes there is a lot of info on there but i think you'll find the same.