The crank appears to be stripped. It no longer opens or closes the window. This window is in my first floor bathroom -- I have no idea when it was installed. I'd guess 1980s.
Tom from SWISCO responded:
June 19, 2019
Thanks for posting! Take a look at our 39-344. Not only is this also a Fenestra brand operator, but the base has a very similar design to your old one. Let me know what you think!