The grip and pommel are a spittin' image of the U.S. Navy's knives. The Mk III is the pattern, (I think), but my memory for this exact detail has faded!
No shock there. During WWII some GIs gave blade parts to Philippine locals to dress up, or integrate with American knife parts. I have a piece that has an American blade, a Bagobo hilt, and Maranao scabbard, all made in WWII.