The Voit POLARIS was the Voit version of the US DIVERS MISTRAL basically.  It is a fine breather on low pressure tanks and is nearly bullet proof.  This particular regulator is in very nice shape and is unaltered by me except for the replacement of the brown perished hoses, mouthpiece, and diaphragm with silicone reproductions.  These Voit regs look so much nicer with the correct Gray hoses in my opinion.