Not sure I understand what "a pretty good deal" means in this context. A SPG is not an expensive piece of equipment. A beat up and scratched SPG from an unknown seller does not sound like a pretty good deal to me at all.
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I think you need a reality check. Not every piece of 60's dive gear is a double hose regulator made of metal. I had a 60's mask that was stored in a basement for several decades. The glass was still good as was the metal strap adjusters. The rest of the rubber was a crispy mess. The beaver tail wetsuit shattered when flexed. That stuff is gone. All that is left are double hose regulators that people collect.Ug ogh ugg ogg ugh garbage put 80's garbage rubbish put in landfill ogg ugg belch scratch fart
Ug ogh ugg ogg ugh garbage put 60's double hose garbage in landfill ogg ugg belch scratch fart