I really like this keris. The hilt is both beautiful and unusual. The blade is quite nice as well. As Jean stated in his second reply, pendokok is probably a better term than selut for the hilt cup. Of course one could always just say "hilt cup".
While we are discussing terminology i am not sure i would refer to the bevelled surfaces here as gusen. Again this is Javanese terminology, but AFAIK gusen refers to a rather narrow bevel right at the very edge of the blade. The classic Bugis bevel here seems too broad to be referred to in this way, but maybe i am mistaken on that front.
I'm not sure if there was ever a buntet on this sheath stem or not. A shot from the bottom might clear that up. I wouldn't worry about the age of the sheath as much as i would the quality. Dress on Indonesian keris are often changed throughout the life of the blade. One would not really expect to find an original sheath on an old blade. Looks like nice wood. Nothing fancy in the carving, but certainly competent. If it also fits the blade well than i would say it is a good marriage. Would love to hear if the hilt cup turns out to be gold.