Anderson double hungs from mid to late 1980's

A home owner from South Burlinton Vermont says:
double pane 27 1/2" X 53"
A customer submitted image of their Andersen sash balances.
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Tom from SWISCO responded:
Thanks for posting! I see you have two balances for two different windows here. For the balance stamped 7#27, check out our 24-737, and for 5#19, look at our 24-531. As you can see, these balances accommodate the stamps of 7#27 and 5#19, respectively.
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