Welcome to the forum Max.
A nice old Madura/East Jawa keris.
The ivory hilt looks like Kojuk Mrenges, though in a less detailed form. It seems to have some age. Is the base wood or horn. It is possible it is a newer part to replace damaged ivory at the original base of this hilt.
The top sheath is a wood i have seen before but can't name. Maybe someone here knows. This style of top sheath is a bit of a village folk art as far as i understand it. I like this carving. The motif is Si Mega, the mythical winged horse. It is regional emblem for Sumenup.
The gandar (stem) of the sheath looks newer than the atasan. The wear and the carving skills look different. But that shouldn't bother you.
Honestly your photos of the blade aren't very good for analysis, but the blade looks like the oldest part of the ensemble and seems to have been fairly well constructed. I would say it was probably an 11 luk blade, though it seems to have lost it's final luk over time along with its finer details. It would be nice to see this blade cleared and re-stained to reveal the pamor better.
If this were mine i would probably replace the flattened mendak (metal hilt ring) with a new bit of jewelry.
