Identification of an indonesian dagger

[A. G. Maisey]

I undertook to post some pics of sangkuh in my possession. I have located one of these, and here are the pics.

Harsrinuksmo has an entry for a tombak of this triangular shape that he calls a "lingiran". In Javanese the word "lingiran" simply means something with sharp sides.

Any of these blades that I have seen have not been tombak, as all have lacked a metuk.

Harsrinuksmo notes that some people are of the opinion that this form was inspired by old-time bayonets.