BluErf, I do apologize for misunderstanding. ron dha nunut is quite unusual on old blade in Java, except the very old one, usually have no pamor at all with greenish iron, which would be a very rare one. IMHO, "within the blade profile" ron dha nunut on Java keris resemble the average quality pieces, while "the out of blade" one is better. But there is different approach for this. Bali keris would look sharper and rougher, while Java keris would tend to be smoother, making the transition between the plain edge to the ron dha/greneng looks smoother.
Wolviex, judging keris age would be very problematic, especially if you have only the pictures. If we agree that this keris from Java, 16-18th Cent. would be the era of Mataram kingdom and Kartasura. I wish to believe it from Mataram, but the ricikan/details and proporsion isn't right. The lambe gajah (lambe=lips, gajah=elephant, that is, the small lips-like projection on the lower part of gandhik, near the sekar kacang point) isn't Mataram neither Kartasura. It has a fine line connected and through the gandhik, suggesting nem-neman era. The ganja and gandhik are too thick for mataram, while the luk/waves not deep enough for Kartasura. The sekar kacang also looks too "fat" for Mataram and Kartasura. The details and shape just like the newly made keris today by a very capable keris maker, but the iron in use suggest it's old. So, for now, I would vote for nem-neman

, but to make sure, i've to handle it myself

Bad idea. Anyway, it is a good one, hard to find even here in Java. Just cleaned and put some etch, you may love it more
About the handle, well, I know nothing about it. Sorry. The handle's shape quite unusual in Java, in fact, I've never see it, but from the wood and finish I believe it's Java. The crippled finger seems to be the carver intention. The wood might be Tayuman, stained with pacar leaf, the common finish in Java. To make sure about the wood, if you can put it off, just drown it in the bowl of water. The tayuman might submerge, while other wood may float. Just make sure the hole filled with water.
As we know, keris still a living art here. People may change the handle and sheath to the newer one. So it is unusual in Java to judge the blade's age from it's handle.