Old window Casement crank assembly

A quick learner from Illinois says:
Can you identify the part number for this window crank/opening device.
operator crank
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Tom from SWISCO responded:
This does look old, so I'm not sure. It's tough to tell with only the base to go off of. Could you open the window and show me a picture of the arm? That would help us determine if we can replace this operator.
A quick learner from Illinois says:
See attached picture of casement operator with the arm.
User submitted image of their window hardware.
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Tom from SWISCO responded:
Hi! Please take a look at our 39-021 window crank. We believe this may be what you are looking for. Let us know if you agree.
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