Oh, no! 
 There are many, many yataghans dated second half of the 19th century. Many gorgeous ones, so your Old Turk was just a "Negative Nancy": Yataghan remained a symbol of Ottoman masculinity for a long time! 
 I do not recall seeing any of the 20th century (maybe one or two). 
 But then, again, Yataghans were produced in a multitude of former Ottoman "colonies" and I would guess that they got extinct even later....
		 
		
		
		
		
		
		
		
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