Thanks all for the inputs...
mick, fearn... the observation and scientific viewpoints are highly appreciated, thanks.
Ki Jayamalelo... the picture provided the answer to why 4 or 6 legs.
Marco, Michael, Michel, tunggulametung... thanks for your references from the hilt prespective and symbolism.
So to recap...
What is the kocet-kocetan hilt?
It's a Balinese hilt form that was inspired by the beetle, (Batara Karpa).
Where does it originate from?
It's originated from Bali and specifically used there.
When the name:"kocetkocetan" rise for the first time?
in W.O.J. Nieuwenkamp; First European Artist in BALI (1997):52
The picture itself is from 1907
in Jasper & Pirngadie's classic book De inlandsche kunstnijverheid in Nederlandsch Indie from 1912 is "kotjčt-kotjčttan" mentioned (fig. 325).
What are its meaning and symbolism behind this hilt form?
The pupa, pupa-like position or yoga/meditation symbolizes fertility, eternity, immortality... (?) ... unsure about this one...
Another question:
Why a beetle?