I can attest that they do exist as I have one with a leather handle. Because of where I picked it up it probably came from the Italian or Africa Theatre of Operations. I don't know about it not fitting the M1 but most all text I have read reference that it does. I will have to look at the tech specs on the M1. My question is specifically to anyone that may have had one or other military equipment that they marked.

If in WWII or Korea you marked you Equipment with four numbers, what did the numbers represent? I think the numbers on this particular knife might lead to discover it's origin.

Thanks for listening