Alside casement window operator.
A handy person from Raleigh, nc says:
July 30, 2016
The casement window operator is located on the bottom left hand side when looking at the window from inside the house. The window opens to the left. The part number on the operator is 1491-2208 or 1491-220B. Hard to tell if the last letter is an 8 or a B. The arms on the operator have the following part numbers. S-1491-260 and S-1491-265. Both the arms have a big R on them. The manufacturer of the window is Alside. I have included two pictures of the part. Please let me know if you have it and how much is it going to cost.
Dave from SWISCO responded:
August 3, 2016