Andersen Balance Replacement

A quick learner from Malden, MA 02148. says:
For double-hung windows. 36" width X 28" height for glass measuring. There is a code printed on the old balance: T2 12#31 7 87.
Please let me know what is the order number for that balance?
Thanks.
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Bob from SWISCO responded:

This looks like our 24-1231 to me. This is meant to replace Andersen balances that included the stamp code 1231, or indeed, 12#31.

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