HERE ARE 3 EXAMPLES OF UNUSUAL JAPANESE KNIVES THAT FALL INTO THE SAME CATEGORY AS YOUR EXAMPLE. #1 HAS A YARI SPEAR BLADE AND IS CARVED LIKE A HOKADO FISH  #2. JAPANESE SHRIMP OR LOBSTER KNIFE.  
#3. SAID TO BE A JAPANESE TEMPLE KNIFE.  UNFORTUNATELY I HAVE NO BETTER INFO. BUT THEY FALL IN THE TANTO SIZE RANGE RATHER THAN THE SHORT SWORD SIZE.
		 
		
		
		
			
		
		
		
		
		
		
		
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