Hi Stu 
Thanks for the information 
Were blunderbuss military issue as the GR lock indicates or would the lock be just used as a standard part on civilian guns 
I know they were issued to post carriages but otherwise were they just civilian personal defence 
I have another blunderbuss barrel in the attic, brass again,  but I think the proof marks are different I will have a look 
Regards 
Ken
		 
		
		
		
		
		
		
		
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