Window crank

A quick learner from St Louis says:
No markings
Old aluminum double window
Glass is glazed in
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Dave Sr. from SWISCO responded:

Thanks for writing in to us. I'm afraid that your operator is no longer available, and I could not locate an exact replacement. I suggest you take a look at the 39-256B Left-Handed Operator. Review the dimensions, and see if you can adapt this to your window.

How to identify casement and awning operators
How to identify casement and awning operators
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