BAY WINDOW CRANK
I believe we can help you with this, but we need to see more of the operator. Can we have you upload a couple of more photos showing the operator from a bird's eye view? We's also like to see a photo showing the arm(s) of the part, and have you give us some measurements on it.
Huh... this one is a bit weird. The first thing to come to mind was our 39-089, but I can't quite tell if your gear arm has that same "Z" shape. It also looks like your gear arm has an offset, but I actually don't think that will matter too much.
Look over our photos for the 39-089 and let me know if this matches up. I know it seems like an obscure detail, but that "Z" shaped arm is an important detail.