Balancer from Anderson Window WIndow measurements are 28 7/16 x 27 15/16

A handy person from St. Louis, MO says:
April 30, 2017
Balancer says 11600-17 or perhaps 11600-47 on the mounting surface. Other side looks like it says 11600A-3. Which balancers do I need please? Thank you for your help!!

Jeff
User submitted photos of a window balance.
A handy person from St. Louis, MO says:
April 30, 2017
If this helps, the windows were installed as part of new construction in 1991.
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Tom from SWISCO responded:
May 3, 2017
I'm afraid the stamps you showed us don't tell us what you have. There should be more stamps on the balance; we will need to see a clear picture of each one. Or just the whole balance in one picture, if the stamps would be clearly visible from that angle. Thanks!
A quick learner from Waterlogged St. Louis Missouri says:
May 4, 2017
Let's see if these are of any help, thank you.
User submitted photos of a window balance.
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Tom from SWISCO responded:
May 9, 2017
We're getting closer! I'm confident that the stamp we need is on the tab there, at the bottom of your recent picture. I can almost make out a "9," but not the rest of it. Could you show me a clearer picture of the stamps on that tab?
A quick learner from St Louis Mo says:
May 9, 2017
Here you go. I am guessing one is plant and date stamp, hoping the other is of help. Looks like 931 perhaps. Looking forward to hearing back from you soon.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
May 12, 2017
Perfect, just what we needed to see. I recommend our 24-939, based on this stamp.
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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