Need Channel Balance for Tilt Window

A quick learner from Watertown NY says:
May 1, 2020
Need 2. 28"
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Bob from SWISCO responded:
May 5, 2020

This looks like a Series 770 Channel Balance. That stamp code is a little unusual for a balance of this length though; with the Series 770 balances, the first two digits usually designate the exact length of the balance. If it's indeed an S770-28 though, you'll need to get the exact weight of the window sash to determine the stamp option to select. 
A quick learner from Watertown NY says:
May 5, 2020
got it - thank you
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Bob from SWISCO responded:
May 5, 2020

Great. Let me know if you have any other questions, and thanks for your business; we appreciate it.
28" Series 770 Balance
28" Series 770 Balance
S770-28
$12.70
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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