I see no markings. The arms are approx 12 inches long and the crank is approx 5 inches wide.

A quick learner from 81632 says:
June 5, 2023
I am looking to replace this window crank that was installed in 1991.
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Tom from SWISCO responded:
June 7, 2023

Hello! This operator looks very similar to our 39-348 at first glance. Look it over and let me know if you agree, or if you had any questions. We also sell the 36-078 guide, if you needed it, though the original can be reused assuming that this is a match.

detail of 39-348
detail of 39-348
Shoe Stud
Shoe Stud
36-078
$6.45
Sill Mounted Awning Operator
Sill Mounted Awning Operator
39-348
$61.10
Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
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How to identify casement and awning operators
How to identify casement and awning operators
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