The fittings and hilt are actually brass, they are just with a lot of patina.
Patterns of the fittings decorations are very similar to Batak smoking pipes that were in use end of 19c-beginning of 20c.
There is a similar sword for sale on a Malaysian website, and that one was collected in Sumatra the late 40s of the 20th century, according to the seller.
The blade looks like a pamor type, I suppose it is imported from Java island. I added a close-up of the blade.
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