Anderson crank window assembly

Thank you for contacting us. One possibility is our 39-389, however we have had some customers in the past who claimed that it would not let the window close completely. It could have been that the arms were too long, which indicates that our 39-390 might have worked. Another reason could be the base of the operator has to be set back a little further from the sash. To be honest, there's no way to say for sure. You have a very old operator and you likely won't find an exact match on the market. If you do find something similar, it may be a bit of a project to get it working.