This is an early version of the M4 knife bayonet that will fit the M1 / M2 carbines. It is manufactured by Imperial. Note the unstated screws on the bottom of the pommel picture indicating early production. It probably saw an arsenal refinish (just guessing) during its service at some time. The blade had no appreciable wear that I can see and the leather handle is tight with little wear and no loosening of the leather anywhere. Everything looks correct and very nice for an early Imperial manufactured bayonet. Great for any collector and extremely hard to come by.