Andersen balance identification

A quick learner from Solon, OH says:

I am replacing a balancer in an Andersen double hung window. The number stamped on the balancer is "BP25 12#31 2 86". Do you have these in stock, and can you tell me the replacement part number? Thanks.

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Tom from SWISCO responded:
Certainly! Check out our 24-1231 Andersen sash balance, Michael. This can be used to replace balance boxes with the stamp 12#31.
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