Very nice example Alam Shah !
Beautiful!
Pamor Uler Lulut , the beautiful worm .
The ukiran is a rare form but it is traditional to Jawa and was a type favored by a legendary folk hero IIRC . The style is called Imam Bonjol .
I believe you can see an example of this ukiran in the Mangkunegaraan Musium collection in Solo . Also , if you notice the wrongko is faceted rather than the usual smooth curved sides .