Indonesian? Spear

[Lee]

I had promised in another thread to post a picture of a spear whose thin white metal sleeve with rolled edges located over the shaft below the spearhead was similar to the sleeve on the scabbard of that keris cuntrik. (Despite the similar appearance, the sleeve on this spear tested as high grade silver with appropriate traces consistent with refining residues in 'antique' silver, while the keris cuntrik sleeve was white brass.)

The length from the tip of the spearhead to the base of the high karat gold decorated ferrule is 18 inches. (The silver sleeve on the pole measures 13 inches; otherwise, the pole is smoothly finished plain dark wood.)

I liked the aesthetic and workmanship of this spear and paid dearly when I found it at a Japanese sword show declared by the seller as Middle-Eastern, but knew that was wrong when I bought it and I have assumed it has come from one of the cultures in Indonesia. I would appreciate any help with more precise localization of it origin and thoughts about its age..