Hi Alexander, 
 
The shape of this mid-15th c. tiller barrel without showing an accentuated, reinforced breech is highy unusual indeed. There is another, similar though preserved in the famous Princely collection at Konopiste Castle, Czechia: tiller stock missing, barrel ca. 1450, length 49.5 mm, cal. 39 mm! 
 
Best, 
Michael
		 
		
		
		
			
		
		
		
		
		
		
		
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