Nice Ilongo Binangon...or you could call it a ginunting....I prefer binangon.
Anyways, about the scabbard. It's all original, except that the leather throat is missing. It was there at one time. You could tell from pics you posted and your comment that you made that the top two wider brass bands are attached differently and easily slide off. Also that portion of the wood is lighter in color which meant something at one time covered it. When the scabbard was made originally, it most likely had the leather covered throat that was stitched together on the back. The two top brass bands slid over the leather to help secure it. As usual with time, the leather probably aged and schrank a bit and the stitching on the back deteriorated causing the the throatpiece to fall apart. The previous owner probably just removed it. I tend to agree with everyone else here about the age...mid 20th C. Nice blade!
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