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					Originally Posted by katana
					
				 
				I found information on the 'horn' ...it seems that it is a French horn adopted by the 51st Yorkshire Light Infantry after Waterloo, later to include 105th in India. 
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 That's a great suggestion but I'm not totally convinced.  All the KOYLI badges I've seen have a white rose in the middle.  Prompted by that I've had a quick search on the net and have found this:
The Westmoreland Light Infantry Militia
Westmoreland cap badge 
The Highland LI also had a French horn but with HLI in the centre.
Is there nothing on the blade to help narrow things down a bit further?
Paul