Hi Rick, 
The sellers description was AFGHAN but I am more inclined to think Ottoman. The containers are wood, so likely to be for measured doses of powder rather than complete cartridges. The stoppers are totally leather--no woolfibre stoppers as in the Omani bandolier which I have in my collection and YES the buckle has a roller. 
Here are  pics of two similar shaped bandoliers sold by Hermann Historica, and described as Ottoman. 
Stu
		 
		
		
		
			
		
		
		
		
		
		
		
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