This is a window crank for a window from about 1988. The part has a number on it, 45035.
Emily from SWISCO responded:
November 18, 2021
Hello!
Start by taking a look at our 39-254E & 39-255E or 39-027E & 39-028E, depending on the length of the arm. Look over the dimensions for each and compare them to yours to see which one matches up to your original assembly.