Hi BluErf,
You posted a Javanese keris, called Megantara Luk 5.
(Ensiklopedia Keris p:288)
It is an exotic keris. The Dapur keris like that is so rare. Many kind of Keris with Dapor like this, can be luk 5, 7 or 9. But it have a special characteristic ; the Luk just at bottom (Jawa : Sorsoran) to midle blade, and from midle to the top of blade (Jawa : Pucuk) made a stright.
Looks like made from Majapahit or mataram Senopaten period, I think

.
The pamor looks like a Wos Wutah.
Just for another example, u can visit :
http://keris.fotopic.net/c364330.html
http://keris.fotopic.net/c311734.html
http://www.geocities.com/koleksikeris/Submegantoro.html
Regards,
Mans.