Anderson window sash balance

A contractor from maryland says:
I have a balance which i removed from a customers window today. It has 1600-17 stamped on it but there are no additional #s anywhere with the exception of a Patent pending # on the rear(11600A-3) can you please help me find which balance i need
A contractor from maryland says:
I wanted to let you know that I did find a number stamped on the end piece and it was badly corroded but it appears to be 731
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Tom from SWISCO responded:
Hello! I'm glad you kept looking, that second stamp is the one we needed. I would recommend our 24-737, which can replace Andersen balances marked with "731."
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