interesting and very likely that as Alan said, this keris may be commissioned by a Chinese gentleman. Decoration on the scabbard matches very well with old chinese satin attire. i can imagine a rather overweight and rich chinese merchant reclining on a sofa in his opium den in jakarta surrounded by his indonesian concubines smoking his bong while holding this keris and admiring it...
it is a rather elegant keris to my untutored eyes....