Old Indonesian (?) mystery sword

[Athanase]

For me it's possibly an old klewang blade that has been resized (to change the shape).
The handle is also very old and very worn, but it was modified at its base (because broken?) At the time the sword was mounted in its current state.
I have the impression that it is an old klewang that has been restored and modified in a more European way in the first half of the 20th century.