An early 20th century Siebe Gorman submarine standard diver’s flood light.
Bronze with dome cover with swivel loop suspension eye, and power inlet, with a cylindrical clear glass well and six bar bolt fixings.
Maker’s plaque to dome cover: SIEBE GORMAN & Co Ltd SUBMARINE ENGINEERS LONDON (PATENT)
Height: 60 cm.
See: Diving Helmets and Equipment Through the Ages. by Anthony Pardoe, 2012. vol 2, page 94 & 95. For similiar lamps.