A 12 bolt Diver's Helmet,
by Siebe Gorman, London. Numbered 17532 on the corselet. The bonnet wi9th screw faceplate and two barred side windows. Fitted with air inlet and exhaust, locking pin and manual spitcock, suspension rings and rope hooks. The corselet with split brailles and weight nipples to the front and maker's plaque. 18in (46cm)high.