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A quick learner from USA says:
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:

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.

Anatomy of a casement window
Anatomy of a casement window
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