Not sure if this is the right part of the forum, but while going through etsy, i saw there's some 'vintage diving equipment'. Not sure of the legitimacy, but here's a link to a reg for starters, if it's any good:
https://www.etsy.com/listing/105750596/vintage-scuba-breathing-regulator-1st
Just another resource to keep in mind I guess. I don't own any shops there or anything.
https://www.etsy.com/listing/105750596/vintage-scuba-breathing-regulator-1st
Just another resource to keep in mind I guess. I don't own any shops there or anything.