Hi Charles,
Very interesting piece you have there! I remember second one from a previous thread.
This latest one has the look of a European blade I think - the fullers are quite deep and well formed. The half moon stamps less easy to see due to the treatment of the blade but do look well struck.
As you say, the real question is how did these make it to Indonesia. Given that you have two there must be more, for myself, it is not hard to imagine an enterprising Arab or Indian trader bringing them over. This seems more likely than direct intended shipment from Europe? I would expect a much greater volume to turn up like in kaskara and takouba if the latter was the case.
A very nice and unusual piece. You seem to have a real talent for finding "cross over" pieces.
All the best,
Iain