Palembang keris?

[PeterP]

Dear forum members, this is one of my latest flea market finds, a rather nice, I presume, Palembang keris. I think a nice one, it's big, the blade is 43 cm (without peksi) and in total 55.5 cm, and, as far as I can judge, it still retains it's original polish and wash. It's smooth, razor sharp, and no signs of any later warangan treatments, otherwise the smoothness would have been lost. The seller told me it came from an Indonesian family who came to Holland in the early twenties.
My questions are, is this a true palembang keris, or is it a blade from another origin combined with a Palembang dress. Next question is, during it's life it had a small accident. It probably fell, and as a result the ganja is askew. It doesn't fit in the scabbard anymore, which is a pity because if I follow the contours it would be a perfect fit. Does anybody has an idea how to get the ganja back in position without damaging anything. Last question. There is some rust. I know i can remove it by using vinegar, or lime juice, or anything mildly acidic, but then I would loose the wash and the polish. As I think it's a survivor, never been treated after it's production, I think it would be a shame to loose that. But that's me, others may think different. But is there a way to clean the blade without losing the finish?