Original U.S. Navy Vietnam War Era Type A3 Oxygen Breathing Apparatus Set in Transit Chest DVD but after 1940 this more

but after 1940 this more ornate buckle was used

which were usually Kapitän zur See (Sea Captain) rank

but somebody managed to take one apart once to see how it was assembled

a definitely sign it is for fire brigade use

The official term for katana in Japan is uchigatana (打刀) and the term katana (刀) often refers to single-edged swords from around the world

Original U.S. Navy Vietnam War Era Type A3 Oxygen Breathing Apparatus Set in Transit Chest DVD but after 1940 this moreOriginal Items: Only One Set Available. In 1953, the Type A 3 OBA began to replace the Type A 2 OBA. It was a closed circuit, self contained gadget. Oxygen generated by chemicals in a canister could be inhaled for around 60 minutes, the effective time limit of the oxygen supply, independent of the surrounding atmosphere. Head straps, a set of plastic eyepieces, a speaking diaphragm, and a rubber mouthpiece were all included with the Type A 3 OBA's