Eric, 
 
Yes, this is the later "Damascus" style twist. 
The earlier types were a stub -iron twist, as shown below; 
 
Richard. 
Manouchehr  M. has some wonderful photos of Persian arms in his book when published, and some very nice photos in his series on Persian arms in Classic Arms Magazine.
		 
		
		
		
			
		
		
		
		
		
		
		
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