Hi All 
Thanks for your opinions. 
I can blow through the barrel and out the touch hole, so it could be used 
Looking at it under a strong magnifying glass there is none of the circular markings going all the way round, sone near the touch hole though. So I do not think it was turned on a lathe I think the main barrel is cast. 
 
It does look like the lugs were soldered into the sides of the cannon rather than cast. As to weather this makes it a later piece I do not know. 
 
Mark you say British proof marks , well done if you can form an opinion from my terrible photography, if they are British have you any opinion on date. 
 
The cost was minimal and I have learned from what I have found out about signal guns so a nice buy either way. 
 
Regards to all. 
 
Ken
		 
		
		
		
		
		
		
		
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