Hi Lew, 
 
congratulation, nice bakatwa dagger, difficult to say exact which age, I think around 1920, maybe a little bit before or also later.  
A little bit unusual seems the bottom of the sheath, normal it looks from the side like a feet, this one seems to be round/cylindric. 
 
Best 
Wolf
		 
		
		
		
		
		
		
		
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