[rasdan]

I agree with Alan and David. I just observe sometime probably between the 1700s to 1800s there is a practice where gold kerises uses very similar style of sheath regardless of the “nationality” of the owner. Composite, but not a work a dealer. Photos below.

Lots of possibility, however. Probably that is the generic type of sheath of the time since western Java keris also uses the similar type of sheath.

Even hilts styles, hilt cups cross borders. Javanese blades or Javanese style blades seems to be a favourite. One thing that shows is that they go quality and the go for the bling.