Ontario USMC Prototypes?

[pwcosol]

I have five of the six. There were three patterns; long blade (similar to OKC 3S),
"Ka-Bar" combat knife pattern, and "Tanto" pattern (now being offered commercially). As Bill P. mentioned, each pattern was made with either a Ultra Carbon (UC) or Diamond Steel (DS) blade. "UC" or "DS" will be found stamped on the face of the bayonet's cross-guard. The appearance of the blades is either a very dark, smooth finish, or what looks like a sandblasted blued finish. I recall a large knife distributor acquired the lot from Ontario, and they are designated the OKC 1FT, 3FT, or 6FT. The bayonets all have the earlier "waffle-pattern" grips, a non-serrated cutting edge (requested and incorporated in the OKC 3S), and the scabbards have only one retaining strap.