Another knife ID request

[Burwabit]

Anyone recognize the markings on this bowie to help ID the maker? It came from my father-in-law and I have no idea about the history. Probably a local craftsman, but worth a shot.

D O with a partial diamond around the D. Other side is stamped 91.

 

[Horsewright]

No idea but thank you for the nice pics. So often we get: "A bowie with a brass guard and elk scales, who made my knife?"