Sheathed Knife/Bayonet....Any Info. on this?

Hi Everyone! Found this Sheathed Knife/Bayonet recently and was wondering if anyone can help me in identifying the maker and weapon it could have been used with. It only has some numbers and a letter as markings . On the blade is Z3510 and on the upper back is the number 241. The handle is made of hard reddish composite wood. It measures 11 1/8" overall and has a 6 5/8" blade. The sheath is original to this knife and is fitted to hang on the belt at an angle.