Based upon what I can see, I'd incline towards 19th century, however, if it has been in a cupboard in Amsterdam for a couple of hundred years it could easily look exactly like this.
Frankly, I've just about given up trying to date keris from photos, it is a pure guess, based upon what I think is most likely.
If I had it in my hand I probably couldn't do any better.
Provenance is really the only good guide.
In any case, whatever age it is, it deserves bit better wewer than that plastic one.
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