Hi Dajak, 
 
I am a bit disappointed and don't buy the old open cup/closed cup classification as a 100% indicator of Batak or Borneo origin.  
As you know I have f.i. an extremely long Batak PP with a closed cup that once was in your collection.  
The other reason, as I described above, was that several of them were popular trade blades produced in India and for them the open/closed cup tell sign doesn't work either. 
The famous PP in Tropen was collected among Toba Bataks and has a variation of closed cup. 
Also at least 3 of the Batak Piso Podang in the Leiden collection has closed cup (but I suspect two of them are trade blades). 
However I agree that most of the time the Borneo Pedang hasn't open cup. 
But sometimes the Batak Piso Podang has closed cup... 
 
It's a tricky sword to classify and I think a lot more research has to be done on it. 
 
Michael
		 
		
		
		
		
		
		
		
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