Yes, Stith, Bausch and Lomb and Kuharsky all made those mounts.
A scope w/o internal adjustments was far easier to weather proof.
A BalVar 8 was a very expensive scope and swapping it between rifles made sense.
A ANIB one is still a fine scope today, first focal plane and tapered cross hairs are still a great combination.

BalVa8 8 2nd model in Stith Mount.

Looks clunky but set up and locked down was solid and weather proof.
Could be swapped to another Stith mount in a few minutes.

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Paranoia strikes deep
Into your life it will creep
It starts when you're always afraid
Step out of line, the man come and take you away