Dinty,
It's a floorboard saw.
It has a ratchet drive which is identical to a Stanley brace.
Foot goes into the aluminium section so you can push down then across as you cut a floorboard.
Used years ago in the UK to cut floorboards when installing central heating etc., I guess it dates to the 50's/60's.
Can't find it on an internet search and I've only seen two. 
Markings are 
Floorboard Cutter
Model TC4
Patents Pending
Made in England by
Melway Products
Maidenhead
Berkshire
Colin
				
			 
			
		 
			
				
			
				
			
			
				'56 Series 1 with homemade welder
'65 Series IIa Dormobile
'70 SIIa GS
'76 SIII 88" (Isuzu C240)
'81 SIII FFR
'95 Defender Tanami
Motorcycles :-
Vincent Rapide, Panther M100, Norton BIG4, Electra & Navigator, Matchless G80C, Suzuki SV650
			
			
		 
	
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