Hello Alan, 
 
Well, the square blumbangan points to the Mataram line (including extant offspring substyles). The ron dha are very crisp - most old blades will exhibit worn down and restored greneng. 
 
From the excellent state of preservation, I'd guess that this blade entered a colonial collection right after manufacture; there even seem to be some working scratches left at the base. 
 
I believe that this blade got crafted in Palembang following old Mataram style; if the ri padan were not sharp on the inside curve (difficult to establish from the posted pics - an angled view would help), this would support the notion. 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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