Window Sash Balance

A home owner from Maryland says:
June 12, 2021
I am having a really hard time reading the part numbers on our sash balancers. The windows are double hung and the visible glass on the bottom pane has width of ~28.5" and the height is ~15.5". I have attached a picture, but am having a very hard time making out the numbers.
Thumbnail of the uploaded file named IMG_2949.JPG
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Bob from SWISCO responded:
June 17, 2021

It's a bit tough to tell, but I suspect part of the faded code on this balance box says 523, or 5#23. See if an identical window in the house has this code more clearly intact. If it's indeed 523 or 5#23, our 24-531 can do the job. 
Andersen Sash Balance, 519, 523, 525, 527, 531
Andersen Sash Balance, 519, 523, 525, 527, 531
24-531
$54.20
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