Vintage Anderson Window operator

A home owner from Vermont says:

Hello, We have a vintage window in our kitchen that is 39" wide and 34" tall. All I can find of the old operator is the 15" arm that does not have any numbers on it. It just says "Anderson" We looked for some sort of info on the glass corners but all we found was A/W logo with "CV" etched in. No numbers. I have included a photo for a possible id.We also have other windows with the same style window, but smaller. Thank You.

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Tom from SWISCO responded:

Hi- thanks for posting! 

We'll need to see a clearer photo of the operator, preferably removed from the window. If it cannot be removed a top down (birds eye view) of the operator so we can see the entire mechanism including the arms would be best. 

A home owner from Vermont says:
Hello, the operator is missing. The only part we have is one arm and the shoes. We have just been using the arm to open and close the window rarely.
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Tom from SWISCO responded:

Thanks for clarifying. Could we at least see the arm and shoe then? Without seeing any of the original hardware, there won't be any way for us to identify what you need. Let me know!

A home owner from Vermont says:
Thanks for getting back to me. Here are the pics you requested.
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Tom from SWISCO responded:

Thank you. I see you have two shoes in this photo. Does that mean this operator had two arms at one point? Also, is this an awning window? If so, our 39-390 may be a possibility.

I want to stress that we cannot be 100% sure what will work for your window based on what you've given us. It will be impossible to know what you have without seeing the original hardware. However, the 39-390 is an educated guess and may be worth considering. See what you think.

A home owner from Vermont says:
Thank you. Yes, it is an awning window that had 2 arms. I looked at the 39-390 and the arms are only 11" when mine has ~15".
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Tom from SWISCO responded:

39-389 is the equivalent operator with 15" arms.

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