I dont know brand of casement windows

They were installed in 1982. Ive sent of photo of the right open window but its the left open window crank that has broken. The outside window part is fine its the hsndle crank broke off. Please advise what i would need to buy ti eemove current item and which replacement part could work.

I also have a skylight were the crank broke this has some sort of chain connected. As its on the roof diffucukt to get photos as well as repair. My question do you have parts for skylights

Helen