100% genuine. Not very frequent, but very well known 
See Egerton  Plate XIV, #624, 19th century. Typical ch'hura from Banu. 
There is an assertion that anything on Afghani weapons with brass indicates 20th century. but this is patently wrong. The Egerton's example has " brass mounts". Also check Egerton's private collection, bought in 1855: several have brass  mounts. 
 I would safely put it as 19th century.
		 
		
		
		
		
		
		
		
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