Consider these sources …
Sandata - The Edged Weapons of the Philippines
Quote:
Bangkung
Considerably rarer than the panabas, the bangkung is a short, single-edged weapon that varies from 50 to 75 centimeters (#21,22). Close to the hilt, the laminated blade is thick and narrow increasing in width towards the tip. The cutting edge often has a slight upward curve. Hilts on older bangkung were of the cockatoo style with a metal sleeve similar to the barung.
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Mine, at roughly 43cm is too small. However, the other features match.
PHIL SWORDS - FINAL SELECTION See bangkung, item 181.
The general overall shape is a match. There are other examples elsewhere also. Finally, this thread in the forums includes:
Show us your bankung, post #13 See the top example, which is here yet CharlesS says it is "NOT a bangkung". 
This is the best match of all.
So
maybe it is either an unusual bangkung or
bunyal (hoping someone can say more about that term!)
Thanks B.
- Dave A.