"Armour Piercing Keris" ???

[Kulino]

Originally Posted by A. G. Maisey

Now you mention it Ariel, yes, the cross section of this type of keris --- the Brojoguno style and his copiers --- is something like an estoc.

There is also a tombak that will pierce breast plates, it is the "sajen ampel" form, and it is a distinctly diamond shape cross section.

Could this be the tombak you mentioned?