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					Originally Posted by  corrado26
					 
				 
				In my photo archive I found pictures of a percussion carbine with a lock signature "2. Scinde Irregular horse", a unit of the EIC in India. I am by no means a specialist of British troop markings and have absolutely nothing of helpful literature  - but could i t be that II/SI stands for "2. Scinde Irregular" (or "Infantry")? 
			
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 That honestly checks all the boxes! Indian issued matches the spring clip, EIC issued would match the non-standard repurposed blade, and the inscription explanation is as close as we are likely to get. We'll done!