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The Cyklon name survives in the Poseidon regulator range if the Swedish company's 2020 catalogue is anything to go by . . .
One of my favorite ads, from 1977
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Wow ! This one looks terribly both bulky and cumbersome. I wonder what you'd fill like underwater with it on your back. Anybody dove one ?
The "cool" factor is an 11, but diving it is like diving with a boston whaler on your back. I have only dove mine a few times for fun (dove my At-Pac without it for 30 years) and it has massive amounts of drag, your exhaled bubbles get into it, it is noisy, and surface swimming on your back is a hoot!
ok, not really "historic" but...