Anderson window balance

A home owner says:
February 27, 2021
This is an Anderson window balance. It measures about 7 inches long. Please help identify.
Thumbnail of the uploaded file named 20210227_151816.jpg
Thumbnail of the uploaded file named 20210227_151744.jpg
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Tom from SWISCO responded:
March 1, 2021

I'm afraid I can't read the stamp in your photo, though that's definitely the one we need to see. Can you tell me what it reads?
A home owner says:
March 1, 2021
I believe it says 11600-16
Profile picture of Tom
Tom from SWISCO responded:
March 1, 2021

The stamp I need to read is the one that your photos are focused on. It's right under the Andersen logo. If you can tell me what that specific code reads, I can tell you which balance will work.
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