This Medi was produced in East Germany and is very robust. The MEDI name comes from VEB Medizintechnik Leipzig, however I believe this model is called the Hydromat 62004. This is the early model and was made about 1962 or `963. The Medi was originally made for the DDR Volksmarine (East German Navy), but was later made a sold to civilian divers. The Medi came with double or triple 7 litre tanks. It is DIN only and a good breather. These are very common even in the USA and parts are still available. This particular Medi came to me with a wrench for on the spot field repairs.