I was very happy finally to buy a "Medi Nixe" rebreather . The peculiarity was that they was modified in the 60 years age by frogmen of the GDR (KSK) for better WOB . Additional was an original mouthpiece for the thin tubes of the first series from 1954 include. She came with original packaging, tools, equipment pass and manual. The unit was in good condition, but dusty. I have to largely restored the original condition and also the KSK variant with the help of some additional parts (ready for dive). Unfortunately was the original oxygen regulator not included, who as this regulator,make a offer please!