Window crank and cover needed

This window was found in the property we bought -- but the crank and cover are missing.

I've included some close-ups of the mechanism that may help in identifying the model. The crank from a new window we bought works on this one -- it's a smaller diameter than the crank on another window (just sent you pics of that one too).

Which crank and cover would you recommend?

I prefer the kind where the crank tucks back into the cover when not in use. :-)

Thanks so much!