1947 Home Window Crank

A handy person from Austin says:
Hi. We are a nonprofit restoring a 1947 home in Austin TX. We have several window mechanisms that don't work & some broken handles. Can you help identify replacement parts. There are no identifying markings on the top, sides or bottom. Just a "1" underneath. Thanks.
Thumbnail of the uploaded file named Window Crank.jpg
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Tom from SWISCO responded:

Hello! This is a very, very old window. Fortunately, our 39-001 and 39-002 operators look like they match up to yours nicely. Look them over and let me know what you think.

Anatomy of a casement window
Anatomy of a casement window
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