Jamb mounted operator for old Awning Window

A quick learner from Chicago says:
Looking for something that will operate these old (1950's) awning windows.
Hinges are exterior and there is no internal hardware, only what you see.
I bought a couple of 39-268 hoping they will work. What do you think?
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I agree, the operator shown in your photo does look like the 39-268. You say you bought a couple of them. Did you try them? If so, how did they work out?
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