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That is funny. A few hours ago a friend in socal found one and I wondered what it was
Scroll down to see Spiro Supra XL 1987. First stage looks like a match?
The made in France stamp on the yoke and yoke screw looking like US Divers/Aqualung helped with the search.
A bit of trivia from the website...
"In 1998, probably after the death of Commander Cousteau's Aqualung brand decided to put all the products manufactured by LA SPIROTECHNIQUE, US DIVERS, TECHNISUB and SEA QUEST under the same name, AQUALUNG"
Maybe is indeed a "twin regulator", one body for two first stages.
Here is a modern version:
V-TWIN - Beuchat