While I am admittedly (and clearly) unfamiliar with the history and weapons of Indonesia and these archipelagos, I am disappointed in the lack of response so wished to at least venture suggestions here.
The basic pattern of the blade suggests obviously a cavalry sabre blade, probably East European and of the latter 18th century into early 19th. The etching style, though extremely worn and indiscernible in the photos is of course indicating an officers sword.
Without searching through references to match the interesting fuller arrangement to classify possible nationality of this blade, the key factor in its appearance in this Indonesian context is of course trade. While the Dutch predominated control in these regions, there are likely a good number of possibilities how this blade ended up in these Atjeh mounts. Only speculation by those more familiar with these trade activities and regional history can offer more viable solution.
Hopefully Willem, these people will step in with more detail.
Best regards
Jim
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