![Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a.. Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..](https://image.invaluable.com/housePhotos/auctionsappraisers/02/700002/H0150-L261352101.jpg)
Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..
![Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a.. Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..](https://image.invaluable.com/housePhotos/auctionsappraisers/02/700002/H0150-L261352115.jpg)
Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..
![Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a.. Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..](https://image.invaluable.com/housePhotos/auctionsappraisers/02/700002/H0150-L261352129.jpg)
Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..
![Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a.. Lot - British deep sea diver's helmet by Siebe Gorman & Co., Ltd, Submarine Engineers, London, copper breast plate and bonnet with brass a..](https://image.invaluable.com/housePhotos/auctionsappraisers/02/700002/H0150-L261352109.jpg)