Hi, 
   The disposition of the fullers is quite typical of some 18thC blades. See attached photograph of a French Petits Montmorency sabre from which I think one could easily craft a blade similar to the Dirk shown here.  
   The Dirk is a nice thing and I think it might be worth your while dropping a line and some hi-res photographs to the Arms and Armour curator at the Kelvingrove Museum in Glasgow for more info. 
Regards, 
Norman.
		 
		
		
		
			
		
		
		
		
		
		
		
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