Regarding resin keris hilts

[apolaki]

Can anyone tell me more about this form of keris hilt? It has a more abstract form but with intricate style in carving or molding because it looks to be made of resin as opposed to wood, bone or other natural material. What is the history of resin use in keris hilt production. I imagine it is one way to tell it is more contemporary manufacture or pinpoint to perhaps a particular decade when resin was being used. Thanks again for all your insight!