Hi Mark. It could very well be a naval dirk. many of them were very pain, with spear-point blades and very simple cross guards such as the one on this dirk. Better pics might help in determining for sure. Likewise, this could be a "boot dagger" type from the Old West setting. Naval dirks ranged in size from a mere 8" or so for dress dirks up to very large examples over 20"! Hard to tell from the pics what the grip is made from. Is that wrapping?
In looking again at this piece, I think this is more of a gambler's dirk versus a naval piece. During the last quarter of the 19th into the early 20th, knives like these had leather 'banding', almost like little washers all pushed tightly together to make the grips. Still, it is a great piece with an undoubtedly colorful history! These things were sort of the precursor to later knives, including trench knives. In profile, it even resembles the Fairborne-Sykes types-
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