[A. G. Maisey]

This is a very scarce item, seldom seen, and I have never previously seen a Bugis style one.

My guess is a family pusaka mounted as a keris.

It is a Tomris, Dhapur Ngapes.

Edit: --- In response to a private query I thought I'd better add this:-

"Tomris" is the Ngoko term, Krama is "Dhuwaos", and when worn in the wangkingan fashion it is referred to as a "Wangwaosan".

It should be noted that the alternate spelling of "Tomris" is "Tumris"