Hmm...I've handled this piece... A beautiful blade. Congratulation! The hilt, typical of a parang nabur but with a shorthened crossguard on both sides. See link for examples of the hilt crossguard...
http://www.eriksedge.com/INDO126.html
http://cgi.ebay.com/ws/eBayISAPI.dll...y=20085&fkxs=1
http://old.blades.free.fr/swords/parang/par04.htm
I doubt that it's a hulu "iku mie", Acehese 'Amanmeru' or a Batak form as well.
The blade however looks like a mandau blade.
Just my 2 cents opinion.