Hi Eftihis 
 
That is a very interesting musket.  As Stu mentioned, the stock shape is done very much in Ottoman/Turkish fashion.  But as Kubur mentioned, the decoration does indeed remind me of Tunisian.  The lock is definitely a Portuguese variant.  Probably made for export.  And the Link provided above which included Philip's comprehensive post is most helpful.   
 
Eftihis:  Could you post a close-up photo of the lock ?  If possible, an outside, inside, and top views ?   
 
Again, a really nice and interesting shoulder gun.  Could have been made for a Tunisian customer using a variety of parts available.   
 
Here is a pic of the later made, cheap quality copies made for the African continent.  This one is in working order, but took some work.  LOL 
 
Rick
		 
		
		
		
			
		
		
		
		
		
		
		
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