The Australian Army had, up until the 1990s at least, the same/similar funnel. Some batches were made by Cecil & Co, Bayswater, Victoria. The centre gauze on the Aust version was hinged. 
 
It was something like 'Funnel, Outboard Motor' or similar... its a long time and another country ago, so I'm a bit vague on details. The drawings provided to the company back in the 60s were dated in the 1930s. 
 
Mike
		 
		
		
		
		
		
		
		
		
	
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