Hello Gajah,
maybe go to Celuk and look for the shop from Bli Ketut Karang, he selling Bali keris and when you get a good contact with him he will show you maybe his own collection. Tell him Detlef from Germany has send you to him, this could maybe from help!
Visit the Bali Museum in Denpasar, they also have a nice collection.
Regards,
Detlef