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					Originally Posted by Pukka Bundook
					
				 
				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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 Richard, here or some detailed examples from the images I posted of Ottoman matchlocks that seem to be of this type or am I wrong.