I cannot offer any opinion on origin of this blade. I only know it is not Javanese or Balinese. 
 
However, regarding the similarity of the sculpting in the sorsoran of Bluerf`s picture, and Alam Shah`s picture, I can comment. 
 
I`m sorry, but I can see no similarity at all between the two. 
The major disparity is that in Alam Shah`s piece the blumbangan is boto adeg, in Bluerf`s it is boto rubu, but apart from that the actual execution of each blade is almost at opposite poles.
		 
		
		
		
		
		
		
		
	 |