I bought this items at a dealer here in austria. The time I went the first – and the last – time to Indonesia/Bali was in 1986. I saw a few antic dealer from Italy and Japan buying the wonderful textiles. Some of them told me they are working with museums. Believe it or not.
I have a friend who is an expert and a collector of the textiles from this area. I even made a documentary about him and finalised it this year. in case you want to watch the movie: You will find it on YouTube.