Identification of an indonesian dagger

[Henk]

Thanks for posting pics of your sangkuh, Alan.

The similarity on the second picture is the forging pattern of the blade above the pamor. That is what is vissible on mine example too.

The difference between your sangkuh and mine is the base. The peksi of your example is round and the base is worked out with rings where the peksi ended and the blade begins, like a methuk then the blade is getting smoothly broader. Mine peksi is square and between the peksi and the base of the blade there is no transition.
As you wrote: Harsrinuksmo notes that some people are of the opinion that this form was inspired by old-time bayonets.
I did find out that the dutch army used such triangular bajonets. But those bajonets certainly weren't forged and made of plain steel.