West German or USA Stoner bayonet?

Hello everyone. I come seeking information regarding a bayonet I purchased 10 years ago, however I never used it nor did I try to research it until recently. My problem is that the bayonet has no markings visible to the naked eye, and it comes with what looks like a M8A1 scabbard with a wire cutter. I have several pictures that I hope will provide a concrete answer to my question. My research has narrowed to the Stoner 63A1 Assault Rifle bayonet, I think they referred to it as a KCB 77LM1 Bayonet? Again my main worry is that this is a copy, although the quality, heft and feel makes me think genuine? I couldn't be sure due to lack of Arsenal or manufacturers mark. Possibly a prototype bayonet? I have run out of ideas at this point. Any help would be appreciated.

   

I've seen that you got a pretty good reply on Gunboards with quite a bit of good information.
Did you ever see this site - https://worldbayonets.com/Library/Articles/eickhorn_kcb_70_article.pdf