A 12 bolt diving helemt in the style of a Siebe Gorman. Brass bonnet with oval side windows and guards, circular front window with raised rim, lashing eyes above, spitcock to the lower right, outlet valve with cog, rear air intake and communications, the copper corselet with front and rear hanging posts, brass rails stamped 'front' and 'back'. 46cm high. Now been to the polishers!