KOREA (?) Copper diving helmet with 4 grating portholes and 12 wing bolts. Fake "Poseidon Hamburg" builder's plate riveted to front. Zinc-lined shoulders. Neck screws to be reviewed, engagement not guaranteed. Oxidation all over; bumps, dents at rear of head, at air hose inlet; a few holes, old welds. The real German POSEIDON helmet has only 3 bolts. Bibliography: For more detailed research on copies of diving helmets with fake manufacturer's marks, please visit http://www.pieds-lourds.com/Pages/casques.cfm?Pays=copies.