Upper window hinge locks. Left and right are opposites.

A quick learner from Evanston, Illinois says:
Need to identify replacement for this part.
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Tom from SWISCO responded:

Thanks for posting! I'm not sure if we have this exact part, but it is very similar in design to our 26-393B. I recommend that you carefully look over our dimensions to see how well they compare. If they differ in a major way, let me know how and we can work from there. It might be a good idea to see yours out of the window, if that ends up being the case, just to play it safe.

Dimensions for 26-393B
Dimensions for 26-393B

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