Well, it certainly looks old. You might have a tough time getting an accurate call on the dapor considering all the blade erosion. I would say that without MUCH closer examination it would even be difficult to determine if the cut away bits on the interior of the blade are original to the design or added at some later date. As to any claims of ownership by Raja Bilah, i would forget them unless you have some clear provenance to back it up. Many old keris come with stories meant to increase their sales price. It is interesting just how much more valuable something can become simply by inference that it passed through the hands of this one or that.

But without supporting evidence they are only stories, true or not, but unprovable, so we need to concentrate on the item at hand.
I am not familar with this pamor. A staining would probably make ID easier, but considering the present erosion of the blade and the remnant of kinatah on the gandik it would probably be better off to leave it alone.