Im happy with the GR and crown . 
True it doesn't conform to normal markings on an ordnance issue but I think we are agreed this isn't an ordnance  musket ( no broad arrow or acceptance stamps ) but was probably made by a contractor who  supplied parts to the ordnance system. The small rectangular stamp on the barrel ( SS ?) looks like a manufactures stamp in which case it should  match a small stamp on the inside of the lockplate so its worth looking.
		 
		
		
		
		
		
		
		
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