When I got it apart, I was horrified to find that the internal mechanism is that of the earlier model metal housing 50 Fathom, which has only one lever and no venturi nozzle. I have a copy of the Voit service guides for the Blue 50 Fathom and Polaris 50 regs, which states that the two regulators are identical with the exception of the plastic housing.
I emailed the seller, who replied he has never had the regulator apart, and wouldn't have known the difference if he had. This is probably true, as the diaphragm, duckbill and mushroom valves were all perished and gummed up, and I even found a spider's nest on the duckbill (!) This tells me the reg has not been apart in a very long time.
The seller asked if I was absolutely sure Voit might not have used up existing stocks of old 50 Fathom parts when assembling the regulator. I suppose that is possible, but can Greg Barlow or any of the other Voit gurus shed some light on this?
