Genuine Dräger DM 20 Oxygen Rebreather backpack. DM 20 refers to the max depth this apparatus was used, the air in the suit kept the O2 level within limits. Also a mix gas version of this apparatus exists: the DM 40. These are becoming very rare now. Condition: not tested, display only, see photo's. Price on request.
Rare and beautiful Dräger DM 20 Rebreather Backpack