Massive brute this! Ted says:- Morris Commercial ‘Quad’ 4×4 Gun Tractor. Mark I or II. With Ammunition trailer (limber) which went behind the Tractor and the 25-pounder was hitched on behind that. 4cyl. engine of 70 b.h.p. (Pistons like dinner plates). 4-ton winch. Had one of these that I restored with a couple of other guys. But no extra bits though!!