I'd be inclined to think of this keris as "generic Javanese".
As Rasdan has said, blade is most likely East Jawa, maybe Madura.
The wrongko could be from anywhere, when I see these slightly fatter gayamans I tend to think of Banyumas, but I've seen the same or similar from along the North Coast of Jawa, & the far East of Jawa, around Banyuwangi.
The hilt is a Javanese planar hilt, stylistically very possibly Surakarta, but again it could be from anywhere, East Jawa uses this planar style also, & it actually originated in Cirebon. Photographs can often distort the true form of a subject, and this hilt looks a bit to short and bunkul a bit too heavy for Jawa Tengah.
In any case, a pretty nice old "every man's" keris, well worth a bit of effort to give it a facelift.
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