Anderson window balance

A quick learner from Rhode Island says:
I need to replace my window balances. The balances I have were purchased over 30 years ago and have the following number: B23 4P1947. B and 4P19 are larger than the other digits and numbers.
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Paul from SWISCO responded:
Thank you for the clear information! Yes, if "4P19" is displayed prominently, then I recommend our 24-431 Andersen sash balance.
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