This is a French Spriotechnique Mistral.  I have not restored this one though it could be done very easily.  I have a French Spirotechnique Royal Mistral that I dive quite a lot and love it.  This was reported to be Cousteau's favorite regulator to dive with.  This one has a rather early all metal mouthpiece T with no one way valves.  The case was designed to look like a ship's wheel and at first glance gives off a Voit look to some.  One problem with these regulators in the USA is that the nozzel is just a little too larges for American tank valves.  before you can use one here in the USA you have to get the nozzel turned by a craftsman.