[David]

Gustav, thanks for posting the example from Old Javanese Gold. I was just coming here to do the same.
Just for further clarification, there is a somewhat different description of this ring in the actual book which provides additional information on its possible origins.
"This kris hilt fragment comes from the island of Ternate in eastern Indonesia, rather than Java, but it is highly similar to Javanese workmanship, the repoussé on the upper face are especially comparable to to those on Javanese anklets..."
Ternate is quite a distance away from Jawa off North Maluku.