I need to identify this spiting. I need 6 of these. Windows are roughly 25 years old. Also note that the window weigh about 22 lbs each.
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Bob from SWISCO responded:
March 14, 2022
This appears to be either an S380-33 or S385-33 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option see the 3230. 
Comparison of the S380 and S385 balance shoes.
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