Nice keris, bad rust
You should clean it the first time you have a chance. The keris's shape (dhapur) certainly not the ordinary one. The two deep fullers are intended to raise the middle part of the keris, so the middle part resembles the body and tail of "naga" snake. It is not the sogokan. Perhaps the blade was made in java, but i'm not quite sure before handle the blade by myself
The bugis peoples are well known as the good sailors and merchants, and their ancestor had travel throughout the archipelago.
One more thing, I believe the blade is very finely laminated. You may see the fine layers of iron under magnifier, AFTER you clean it. So, just clean it Mykeris, after you get the permission, of course