I've seen that form in metal Gustav, one of the ones that I have seen, originally had a little cup & the turned stem had the same form as your wooden one, but that little cup had a big piece missing.
The next time I visited the owner of that keris he had filed the metal cup down, so that only the stem & a tiny cup was left --- very similar to what you have shown in wood.
I've also seen wooden mendaks on Javanese keris, & wooden wewer on Balinese keris, not all that uncommon & usually from an ebony.
Seen the same thing in ivory.
So the hilt ring can exist in wood & materials other than metal, but Adam's is the first wooden cup-form I've seen on a Bugis style keris, and the form of Adam's wooden hilt ring does not really echo any Bugis form that I can recall having seen.
This, of course, does not mean other fittings like Adam's do not exist, it just means that I have yet to see another.
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