I've run across a couple of these bolo - preliminary identification is/was Mandaya, but now that there have been more Mandaya items recently discussed here I don't think that's correct. It's a rather distinctive style -
Tom Hyle found this new example.
Here's one I had in my collection a couple of years ago, it went as a gift/swap to Conogre (who may still have it, I'm not sure):
Gotta love eBay seller ingenuity - when I found the Conogre chopper it had a bowling trophy finial on the tang spike:
We think this is the "original owner":
Any ideas on who/when/where?