Thank you both for all this information.
I admit that if I thought of Bhima it is because of numerous similar identification seen on internet on Balinese handles (very close to those generally attributed to Bayu but without the miroir).
But you are right apparently, after some research after reading you I realize that it isn't because a thing is very often repeated and taken everywhere that it is true ...
Here is an overview of Kriss, no sheath unfortunately and a simple blade.
For the "wooden ball" under the handle, I think it's a fairly "new" to compensate the absence of the mendak and a pesi too long.