The Dutch Diving Helmets are made by Kees de Jonge in The Netherlands. In the early 1990s Kees started a diving school, specialising in helmet diving using a Siebe Gorman diving suit. Together with Bert Dodde and Raimond Dupont, Kees formed the Dutch Working Equipment Group. Over the years, Kees used every opportunity to keep the diving helmet history alive, not only by giving diving lessons and writing a PADI Brass Helmet Diver Specialty Manual,
Augustus Siebe Diving Helmet. Queensland Museum holds a historically significant collection of diving helmets. The Augustus Siebe Diving Helmet dates between 1840 and 1844, and is the second earliest standard dress diving helmet in the world and one of only 4 known examples of its type.