A recent find, A cylinder Marked No 603 Mk 1 on the base, and HBS 1959. Painted markings as per pic. Push fit snap on lid. Approx. 5.5" tall and 4.25" wide. I would quite like to know whether these flares would have been 1" or 1.5" and also would this be for Boat/Ship or maybe Vehicle or Aircraft use ? No contents or packing

