As promised the lock detail not yet posted of the two other jezails. 
The one with MOP decoration similar to yours does not have the RAMPANT lion but has a lion standing on all four feet. The date, if in fact it is one, is in Hindi I think. No doubt someone here will be able to confirm or deny that.  
The other (percussion) jezail has no EIC or any other marks, but a string of I.I.I.I.etc. Not sure what that signifies, or maybe it is just part of the decoration. The lock itself looks to me to be a civilian type rather than military. 
Stu
		 
		
		
		
			
		
		
		
		
		
		
		
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