Salam Pak Ganja,
From your vast experience, where does this wayang hilt come from?
I thought I saw almost identical to this one i.e. demi god (rasaksa?) bowing before a king that was on sale here in KL. The seller told me it was Maduran Bajing or Bajang. If my Javanese is correct, Bajing means squirrel, and bajang is one of the feared rasaksa....
From your composition of the hilt & ferrule, I can also adduce (wild guess) that your complete hilt is of Sumbawa's origin
.