A home owner from Silverthorne, Colorado 80498 says:
June 19, 2023
There are no markings on either the window or crank. I do not know the manufacturer. This part is roughly 40 years old.
Lauren from SWISCO responded:
June 21, 2023
Hello, thank you for posting,
Your operator resembles the 39-385 and 39-386 Pella Egress operators. Please review the overall style and dimensions to confirm a good fit! Let us know what you think and if you have any additional questions.