The blade style here certainly seems pedang lurus-like in appearance, but almost moves to be a more yataghan-like tusuk form.
While the hilt and scabbard are not typically Javanese in appearance, I would hazard a guess that they are an artist's interpretations of an "art deco" decor for an otherwise traditional sword.
I agree that it probably is Javanese and likely comparatively late, not much more than 100 years old, if that.
It is a lovely, and graceful piece.
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