Just to add to what Detlef has written, it is the gayaman (everyday) form of Surakarta dress. There is also that ladrang (formal) style.
"Luk" as Detlef wrote, refers to the number of waves. There is a specific way to count these and by that method we count 9 (both sides of the blade are counted).
I would also say that it is the dress (sheath and hilt forms) that is Surakarta. This appears to be village work to my eye, not the higher end spectrum to be found with members of court or wealthy merchants, and it is always difficult to place such keris in exacting geographical locations. Though certainly the blade could come from that time and place.This appears to be a keris made for common folk by the local smith. Probably 19th century. It is not in good stain (warangan) so it's difficult to say what pamor pattern the blade might have. Probably the common wos wutah, but the blade would need a warangan (arsenic and lime) treatment to bring out the pattern better to know for sure.
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