We have lived in our house for 27 years and the bay window was installed a few years prior to moving in. There is the name TRUTH on the base of the window crank.
Bob from SWISCO responded:
May 17, 2019
Thanks for writing in. I believe you might have an older version of our 39-035 Dyad Operator. Look over the dimensions and see if you think this would be a good replacement.