Dave Sr. from SWISCO responded:
March 29, 2024
Hello there! Thank you for reaching out to us. This is a very old operator. We don't have an exact match but you could consider the 39-353 and 39-354. It doesn't have the same arm length as yours, but it may still work for your window. Have a look and compare the dimensions and mounting hole locations with your old operator to see what you think. Alternate image for 39-353
Close up view of the metal button
Alternate image for 39-354
Side profile view with measurements
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