Marcus, 
 
This is a beautiful sporting gun!     
I would very much like to see the lock internals, plus a photo of the buttplate tang and the trigger-guard, plus the sideplate opposite the lock. 
 
The shape of the lock and stocking up of this arm says Corrado has the date right...late 17th -early 18th C. 
 
Again, a fabulous gun!
		 
		
		
		
		
		
		
		
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