A very nice piece, Shayde! It does indeed have many of the elements of a possible naval dirk, including the simple, but stylish guard and fluted grip/capped pommel. The blade shape and design, however, make me wonder if this might be a Philippine side knife. many of these types do resemble Euro dirks. I'm just not sure-
Perhaps some of our Ethno experts could weigh in on naval dirk vs Filipino bowie-style knife. In any case, a very fine and old piece! (Unfortunately, many collectors do get fooled by some of the Filipino/Malay swords, that also often resemble early Euro cutlasses and colonial American hangers. Throw in the confusion with Spanish colonial and its a whole 'nother ball park!)
Mark