Crank handle with end sticking out. Most have hole in handle.
A home owner from Arlington Heights, IL says:
October 3, 2016
Crank handle with end sticking out. Most have hole in handle. There is no brand etched in window. House was built in the 19 60's. These are the original windows.
Dave from SWISCO responded:
October 6, 2016
I'm not sure what can work. Our 39-226 comes to mind; this has a 5/16" hex insert. Does that match what you need?