I'm certain it is a freewheel (possibly an Atom or Regina) and not a cassette. Have you checked the SA hub date? Finally, IIRC, a '61 Varsity was an eight-speed with a four-speed freewheel.
__________________
Bob
Enjoying the GA coast all year long!
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Last edited by pastorbobnlnh; 05-01-22 at 06:25 AM.