Window crank

A handy person from Florida says:
Looking for a window crank
User submitted image of their window hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I think this operator could be over 40 years old. It looks very heavy duty. We have the 39-257B and 39-256B, which are a newer type, but I'm not sure if they can work. Look them over and see how well our dimensions match up to yours.
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