Hello, Vandoo has actually a very good remark that I also never thought about before; that the leather sheats are (sort of) introduced by the Spanish. Personally I dont think the leather used is from the native carabao/waterbuffalo as am really not sure if the filipinos knew how to make leather from hide (intricate proces).
Than I guess the file would also be of Spanish origins?!
This Tabak would date before the resistance against the Spanish I reckon. As most examples after (katipunan) would have a handle carved as a fist or an officershead (wright?).
Again, a real gem Sajen! Who wouldnt want to own such a piece!?