Window does not close

The window cranks open and close but will not close completely. Like it's off center or the crank does not crank enough to close the window. I'm thinking i need to replace the operator. The window is a Crestline. I have yet to see even the same type of handles as these windows have. Can you tell what model this crank is? Does it sound like the operator is what needs to an replaced? I think the damage came from the window being open on a windy day. Not much confidence in Crestline quality.

Thanks for reply. Here is a pic.