It's a Cattaraugus 225Q, the "Q" is for Quartermaster. This was one of several knives the military procured during WW2 from vendors guided by Quartermaster specifications for a general purpose/utility knife. Case also made "Q" knives for the military and a handful of others (such as Camillus, EG Waterman, Western, Remington/PAL) met Quartermaster specs as as WW2 equivalent to COTS material today (
Commercial
Off
The
Shelf.) I have a couple in my collection, and IMHO they're excellent knives, undervalued and with a good WW2 history; a lot of them did go to the USN and USMC. I'm at work right now so I don't have access to my reference books (MH Cole, Frank Traszka) but here's something Frank wrote about the Cattaraugus 225Q:
http://www.usmilitariaforum.com/foru...taraugus-225q/