751 balance stamp

A contractor from Pennsylvania says:
July 3, 2018
The stamp on the balance I have is 24. No letters after it as in the chart.
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Tom from SWISCO responded:
July 5, 2018

If there is no letter following the number 24, weigh your window sash and consult the chart in the product description, below the main photo of the product on our website.
25" Series 751 Channel Balance
25" Series 751 Channel Balance
S751-25
$11.25
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