carlo
It seems to me a standard commercial version, but I could be wrong.
At the Lan-Cay web site
http://www.lancay.com/news.php there are, on the main page, some unfinished blades with (what appear to be) your m9's markings.
They say, also, that "These are specialty blades that Lan-Cay makes in a very limited numbers plus are hard to find". So even if they are not military, should be quite rare (according to them!).
redshanks
Thanks carlo, I am such an idiot!
I had no idea that Lan-Cay had a website. It would appear that what I bought on eBay is not a prototype of any kind, it's just one of many aftermarket knives that they make for sale to the general public. Nothing special, just a knife that sells for $89.95 through their dealers.
Slufstuff
This M9 is in the same CONFIGURATION as the Lan-Cay USMC prototypes, but the prototypes did not have the USMC Eagle Globe Anchor emblem on the reverse. The real prototypes also did not carry the "M9" marking on the front of the blade. They were marked "USMC Lan-Cay" on the front, no marks on the rear. This bayonet above is a commercial model, it is definitely not one of the USMC competition prototypes. The webbing and handle are the same style as the real prototypes, however the USMC competition pieces were only submitted in tan and black, not green. HTH