Thanks Marco and Bill. 
 
I also have the new Batak book by Sibeth but I will be away from home until Monday to check it. (It's quite heavy so it could be worthwile to pick it up in a museum shop instead of having it shipped.) 
On the colours it's of course always a bit dangerous to interpret too much in the meaning of similar symbols between totally different cultures. 
Sometime it works and sometimes the same symbol has another meaning... 
The chain motif I find Batak and as Ben mentioned it doesn't look like the Islamic motifs of the neighbouring people. 
 
Michael
		 
		
		
		
		
		
		
		
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