This is an Andersen casement window crank; the underside has the number 7191 and also a 3. I think it has 12 teeth. The condo was built around 1978. Thank you for any help you can provide in replacing this part.
Casey from SWISCO responded:
April 2, 2021
Hello,
If the spline diameter is 3/8" then you can use our 39-267 Andersen handle. Take a look and see how the specifications comapre. Thanks for posting!