Our Agent found this in a unique antique shop in Jakarta along with a multitude of old and rare Indonesian weapons and bronze statues. The proprietor says it was from the early- to mid- 1800s. He also thought it might have been made from descendents of the Medang Kingdom of Central Java.
I have no way of verifying that but it certainly is old and a rare conversation piece.
Notice the asp/snake in the lower area and characters on the sheath.