The Hansen ‘2 bolt’ divers helmet made by Helge Larsen.

The inventor of the 2 bolt  helmet, Peter Hansen Hessing licensed the british company Siebe, Gorman & Co., Ltd. to manufacture his helmets. Initially they were not manufactured in important numbers but after ww2 the ‘Nordisk Gummi Fabriken’ of Kopenhagen decided to extend their merchandise. Since years they had been manufacturing the divers suits and air hoses, now they were offering complete helmets for sale. The helmets they obtained from 2 sources: the british company Siebe, Gorman & Co. Ltd. and the danish helmet manufacturer Helge Larsen.


the scrapbook of diving history