Crowns on Aceh weapons revisited

[Maurice]

Also the enamel is partly gone and partly still there...(could be because of use or age?)
As I can conclude from your image, the middle of your rentjong also misses the enamel partly.

But what are the features you think they are older types?
Is it the shape of the upper crown you can find back in the deep carving of the handle?
Or are it the motifs on the golden crowns you are looking at?