A 6 bolt Diver's Helmet,
by Siebe Gorman, London. Numbered 13737 on the bonnet and corselet. The bonnet with screw faceplate and two barred side windows, air inlet and exhaust, telephone socket, locking pin and manual spitcock, rope hooks. The interior with crown bayonet-fitting microphone socket and chin switch. The corselet with split brailles, weight nipples to front and back, and maker's plaque. Bonnet and corselet tinned inside and out. 18in (46cm)high.