Hello, 
 
The last blade posted by Bill bears an uncanny resemblance to a western bill hook also known as a fascine knife. This European variant is purely a tool and not a weapon, used cutting brush and building fortifications. Could the above blade be an European one rehilted and adopted in India and SEA? 
Attached are are some pictures I found on google. 
 
Regards, 
Emanuel
		 
		
		
		
			
		
		
		
		
		
		
		
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