Hullo again Fernando . Just found this image in an old post of yours . It looks relevant so I am re posting it . You obviously know about Portuguese firearms so where in  the sixteenth century would you place it ? The stock looks early 
and the lock has some similarities with the Spanish aqujeta but with an internal mainspring . Since it hasn't got a half cock dog do you think it has an additional  separate flashpan cover?
		 
		
		
		
			
		
		
		
		
		
		
		
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