Unable to see any markings

A quick learner from Orange, CA says:
February 2, 2021
I have typically found the various needed parts in the past. Unable to find a section that covers crank type windows. Please point me to the appropriate section. Thanks for your guidance
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Tom from SWISCO responded:
February 3, 2021

Thanks for posting! This looks like a match for our 39-253RB operator. We also sell the 39-452 cover and handle separately. 
Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253RB
$30.70
Encore Truth Operator Cover and Handle
Encore Truth Operator Cover and Handle
39-452
$12.05
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