Hello AHite,
My opinion the blade is very likely Madura or East Java. The sheath could also be Madura or East Java, but West Java is a probability as well.
I am not sure about the hilt, but probably it is also East Java, thus the combination of the sheath, hilt and blade in my opinion makes sense. However the combination of the fittings does not really matter since it is very normal a blade and the dress got changed/switched.
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