Window Balance - 770 Series

A home owner from Columbia, TN says:
I've been able to determine this is a 770 Series.....just wanting to make sure that I am reading the 'B' code correctly
User submitted a photo of a window balance.
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Tom from SWISCO responded:
This code actually doesn't match any of our stamps for the S770-28. I recommend that you weigh your sash on a scale to determine how heavy it is, then referring to the chart we show on the S770-28 store page.
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