Hi, 
   I suspect Rick is correct and this is a reworked machete blade. The crowned V.R. could easily be a manufacturers way of giving his goods a stamp of perceived quality rather than a British military marking. Have a look at these matchets/machetes and note the triple fullers. I think the blade in question although substantial looks from the photographs to be too thin to have started life as a large knife. 
Regards, 
Norman.
		 
		
		
		
			
		
		
		
		
		
		
		
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