Hello Eric,
Welcome to our forum!
The bone hilt seems to be from Bali; not that old (post-WW2) and was never fitted on a keris.
The keris as well as its fittings seem to be from Madura. The hilt does look village-made and post-WW2 to me; I'd guess that the blade is older but it's certainly wise to be cautious in the absence of safe indicators of age as suggested by Alan:
http://www.vikingsword.com/vb/showpo...7&postcount=66
Regards,
Kai