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细节
A 12-bolt diving helmet by C.E. Heinke & Co. Ltd., number 431 (matching), circa mid-late 1950's
the tinned spun brass bonnet with cast face plate, left mounted spit cock valve, circular side ports with cast grills, weight hooks, hinged securing pin, air inlet with non-return valve and screw cap, adjustable exhaust valve; the cast bronze tinned corselet embossed with makers name and number, front and back weight pins and signed and numbered straps; the interior with air vents -- 19in. (48cm.) high
See illustration
the tinned spun brass bonnet with cast face plate, left mounted spit cock valve, circular side ports with cast grills, weight hooks, hinged securing pin, air inlet with non-return valve and screw cap, adjustable exhaust valve; the cast bronze tinned corselet embossed with makers name and number, front and back weight pins and signed and numbered straps; the interior with air vents -- 19in. (48cm.) high
See illustration