Andersen Sash Balance

A quick learner from Norton, Ohio says:
Stamped numbers are B924 4#19 685 and 1600-17. Both units have the same markings.
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Tom from SWISCO responded:

Thanks for reaching out to us! Based on your stamp of 4#19, my top recommendation is the 24-431. I am very confident that this balance will repair your window. Please let me know if we can be of any further assistance.

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