Anderson window balance

A quick learner from Potomac, MD 20854 says:
May 22, 2023

The old balance has the following notes:

Anderson Corp(AW)

Bay Port Mann

E73 9#31 10 83 and 11600 17

My window is 39 years old.

Could you identify this part?

I had an order for this part some years ago.

But I forgot the number for it whether 737 or else.

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Emily from SWISCO responded:
May 24, 2023

Hello there!

Thank you for reaching out to us and welcome back! Our 24-939 would be my pick. This balance is designed to replace those with a 931 or 9#31 stamp. Take a look and see what you think. 
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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