My opinion about this
http://www.ebay.com/itm/U-S-LAN-CAY-...p2047675.l2557 : It is a Std. fuller... I think the ends of the fuller were milled to a 180 Deg. round,
the rest of the fuller was forged, that is why it is rough ? The other M9 is a scrap blade... amen
Just my thought.
Some years ago, when Barry Brown the Lan-Cay Cie owner was with us, he had sent me as present the same model that you have.
I exchanged this model for an M9 BLUE.
If this bayonet was the model 93 it would have reached 900 dollars with my bid.