SWISCO - The Replacement Hardware Authority

Which Andersen casement window operator do I need?

A home owner from Massachusetts says:
I think this window is from the mid 1970s -- The window etching has an XI in a circle and a JD. I do not see any other letters or numbers.

The visible glass dimensions are 15 9/16 x 48 1/16.

It has a straight arm operator that is about 9 inches long.
Profile picture of Tom
Tom from SWISCO responded:
Please remove the existing operator from the window and then take a few pictures of it for me to see. Thanks!
A home owner from mass says:
here are pictures
User submitted a photo of their operator.
Profile picture of Paul
Paul from SWISCO responded:
This looks like our 39-094. Check it out and see if you agree.
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