Originally Posted by blue lander
Could it be a plug bayonet?
As noted by Fernando, an excellent suggestion, and quite feasible if that grip obviously would concur with a gun barrel. The frontier smiths were quite creative and innovative, and often followed known European styles in fashioning their implements and arms etc. The colonies in New Spain were known for their array of often long obsolete forms of weaponry and all manner of armor, which of course was often duplicated in leather.
Clearly the center rib on this would offer strength in penetration so also would support the idea of a plug bayonet.
I honestly had not thought of that! Well done Blue Lander! Thank you .