Picked this up a while ago off of EBay. Only 500 were made. What would its value be?

These range in price based on condition, completeness, etc. Your example looks pretty decent for a fielded  piece. Ballpark is around $400 to $500. Some collectors like the "been there - done that" look. I received my own, "1st issue of 500" several years back. A collector friend owned two unissued bayonets and sold one to me. Probably paid around $250. for it then, but would take awhile to confirm it...

Thanks PW. I paid $260 for it off of EBay. Not too bad of an investment. Going to hold onto it for a while. 

MilNut: 

Almost forgot about this extensive post from 2019.... enjoy!

 

https://www.usmilitariaforum.com/forums/index.php?/topic/322039-usmc-ontario-okc3s-1st-fielded-prototype-bayonet-1-of-500/#comment-2586703

On 8/11/2025 at 8:31 PM, MilNut said:

Picked this up a while ago off of EBay. Only 500 were made. What would its value be?

Can I ask what is the difference with the prototype and the one in actual service?

Manchu, 

  The 10,000 ft answer: the grips have crosshatching and the scabbard has no strap that goes across the hilt of the bayonet.

Manchu Warrior,

I saw one of these in 2022. A friend showed it to me. He had no idea what kind of Marine bayonet it was, and at the time, neither did I.  

The first thing I noticed is that it was an M9 with an OKC 3S blade. I also noticed that the scabbard is different than either the M9 bayonet or the OKC 3S bayonet.  Then I noticed the cross hatch pattern on the grip. 

With a little research, I found that is a "First Fielded Prototype". sent to the Marines for use and testing. They were extensively used and I believe that most saw use in Iraq and Afghanistan.

That's a great find and a very good price.

Marv

I get one this Bayonet

And share some my 

Ontario OKC USMC bayonets & ARMY bayonets