Details
A 12-bolt diving helmet by Siebe & Gorman, number 1921 (matching), circa late 1870's
the hand-beaten brazed copper bonnet with non-return air inlet valve and blanking nut (factory added upgrading), adjustable exhaust valve, right mounted spitcock valve, lashing eye's, upgraded hinged securing pin, weight hooks, cast cross-banded oval side ports, removable front port and air ducts; the corselet stamped on the front SIEBE & GORMAN PATENT, front weight studs, brasses engraved Siebe Gorman & Co. London and front/back as appropriate -- 17in. (44.5cm.) high
See illustration
the hand-beaten brazed copper bonnet with non-return air inlet valve and blanking nut (factory added upgrading), adjustable exhaust valve, right mounted spitcock valve, lashing eye's, upgraded hinged securing pin, weight hooks, cast cross-banded oval side ports, removable front port and air ducts; the corselet stamped on the front SIEBE & GORMAN PATENT, front weight studs, brasses engraved Siebe Gorman & Co. London and front/back as appropriate -- 17in. (44.5cm.) high
See illustration