Roto Window Operator

A professional from Rochester NY says:
The only numbers stamped are: OPO52020 / OPO5-7564-03 The operator is white in color, and the measurements are: 4-1/2" long, mounting plate is: 3-5/8" long
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
You have what looks to be an older version of our 39-329. See if that's a match. If so, you will also need a new handle, so see our 39-205 as well.
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