There is little question that the sheath is recent work, though the hilt obviously has some age to it, but it clearly looks like Indonesian work to me. I have never seen a European blade with this type of pamor work.....and why would Mr. Maisey, a man with half a century (sorry Alan, not trying to make you feel old
) of experience and exposure to Indonesian weaponry so clearly identify this weapon by name(s) if he wasn't familar with it? It is obviously something he is familiar with.