I found this yesterday. Its a mess of different brands; the tank is a 1954 Healthways with a US divers valve, on a Voit Snugpack. The Sportsways Navy Unit single hose seems to be in decent shape, but it could use a new diaphragm on the first stage as its pretty hard. It could also stand to be mounted on a K valve as the built in reserve crashes into the tank's J valve, ensuring that it can never be properly used...
I am sure its not anything special, but it the regulator worth fixing? I wouldn't mind having it as a backup for my Mistral. Where might one get a diaphragm for this?
Also, who in Minnesota can be trusted with a 57 year old cylinder? I got the valve off and haven't had a good look inside yet, but it had air in it and didn't have any water inside.