Can't find any numbers or markings on the existing hardware and no markings on the windows to see who they where made by
Bob from SWISCO responded:
May 5, 2020
Take a look at our 39-031 and 39-032, or our 39-155 and 39-156. The only difference between these two sets of casement operators is the length of the link arm, so compare both with your old hardware to see what matches up best. For a new crank handle and cover, see our 39-114L and 39-107.