As a dagger mounted tombak but from where?

[Sajen]

It arrived today, I've cleaned the blade from surface rust but it needs a bath in lemon juice to clean it properly from all oxidation. Until now I haven't removed the handle to have a look at the pesi/tang. It's a big and heavy Spear point with 1.115 gram with handle and scabbard.
But I've polished the mounts. Here are some first pictures.