Help identifying old Anderson window balance

A home owner from Fort Collins, Colorado says:
July 23, 2023

Hello.

We need to order replacement window balances for several old Anderson double hung windows. Image attached. The number says B 4 25 7 70.

Which replacement balance do we need?

Thank you!

Karla 

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Bob from SWISCO responded:
July 23, 2023

Hi Karla. See the 24-431. This is meant to replace old Andersen balances that have the stamp code 425. Let me know if you have further questions. 
A home owner from Pennsylvania says:
August 13, 2023
I need to find out what sash replacement I need for my anderson windows. the old sash number is #K15 823 6-88

Thanks,
Paul
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Tom from SWISCO responded:
August 14, 2023

Hello! Based on your old stamp of 823, my top recommendation is the Andersen 24-837 sash balance. This is designed to replace all older balances with that same 823 marking.

Please feel free to reach out if you had any other questions.
Andersen Sash Balance, 419, 425, 431
Andersen Sash Balance, 419, 425, 431
24-431
$54.20
Andersen Sash Balance, 823, 827, 831, 837
Andersen Sash Balance, 823, 827, 831, 837
24-837
$54.20
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