Well it's a very good example. It's not a Meccan jambiya as defined by collectors, but it's a jambiya from Mecca! 
I guess the Meccan jambiya was defined by the ones hold by Lawrence... 
Your example has some clear Omani inspirations... 
Like this one, an Arab man in Jeddah, 1918...
		 
		
		
		
			
		
		
		
		
		
		
		
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