ID help unusual Indonesian (?) tombak (?) w/ elaborate carved scabbard

[Gavin Nugent]

Its always nice to find the spear heads with the covers, nicer still to find full complete spears.

He is a little detail extract from one sitting here on my desk.

Alan, how common was it to have the blades of these spear heads "signed" for want of a better word or perhaps better suited, "engraved" with native script?

Gavin