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A quick learner from USA says:
December 2, 2020
1954 original on crank out verticle casement type window. Crank handle does not engage internal gearing. Have not yet been able to disassemble from window frame but aim to extract assembly and replace.
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Bob from SWISCO responded:
December 4, 2020

Check out our 39-001 and 39-002 Operators. Look over the pictures and dimensions, and see if you think this could work for you.
Window Crank Operator, 9"
Window Crank Operator, 9"
39-002
$17.45
Anatomy of a casement window
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