If you are among the many Conshelf aficianados you might be interested in some cosmetic improvements, or even a Supreme upgrade kit, complete with Silicone oil.
A beautiful new front cover and clamp ring, or even a new second stage body (two versions available) will make your reg look great. Rings have a few minor tarnish spots from laying around for 30 or 40 years, and may clean up some. The Supreme outer diaphragm has some cosmetic spots from minor silicone oil leaking that started to attack the styrofoam. The Supreme decal is a little wrinkled, so no guarantee if it will smooth out. All is new old stock.
Other parts available for first and second stages, but not shown for Conshelf, Calypso, Calypso-J, Deepstar, etc. Ask if you need something you haven't been able to find.
Clamp ring, no screw, $10 (tarnish spots came right off with a little Barkeeper's Friend metal polish!)
Front cover, $15
2nd Stage Body, either type, $25
Exhaust Tee, $15
Supreme Upgrade Kit, $30
Please contact me by email for fastest response to your questions.