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					Originally Posted by  fernando
					 
				 
				Yes, an assembly number, most certainly. Could you check if the other pistol also has a number in the same place (barrel tang) ? 
			
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 The photos of several Scottish pistols shows various locking solutions in half cocked and fully cocked position. Thank you for pointing out this variations. I simply found a photo that better ilustrated a pair without any of the locking systems. Anyway the aforementioned is besides the point  
Assemply number 4 with a five above: