Don't think I've seen this before. I was struck by how "Indian" this yataghan looks, particularly the floral decoration. Any chance of a close-up scan? 
The bolster is practically of khukri type. 
 
So eastern movement of the Macedonian/Greek kopis, eastern development, and a western return as yataghan. 
 
Greek kopis/machaira -> Indian adoption, mixed with local experimentation -> sosoun pata and khukri -> yataghan. 
 
Thoughts...
		 
		
		
		
		
		
		
		
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