Window Balance Stamp

A quick learner from Wesley Chapel Florida says:
July 28, 2020
My balance has the stamp "28D USB" on it. It does not match an option. Any help would be appreciated.
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Bob from SWISCO responded:
July 30, 2020

I see you were looking at the S380-29. For a 1/2" Non-Tilt Window Channel Balances like this, a stamp code of 28D correlates with our stamp option of 2840 (e.g., 28A=2810, 28B=2820, 28C=2830, so forth...). Let me know if you have any other questions.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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