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It is still called the rule of thirds counselor!
I have a white stang tank with that valve. Unfortunately I gave the old reg to my lds 25 yrs ago - my dad’s old gear.Ran across this Voit ad from 1962.
I am surprised the model is shown wearing the regulator so high up on his back. It's neck-high!
Next your gonna tell me The Zone System is still in use.
The legend never fails to disappoint!
Thanks for the interesting facts around that picture. Really starting to wonder if there is anything you don't know!