1/2 inch wide 28" long Hallmark Window Channel Balance

A home owner from Chula Vista CA says:
May 28, 2017
No stamp on part number on original window. I believe it is a 380 or 385 but can't be sure. Is there anywhere else to look for a part number?
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Tom from SWISCO responded:
May 31, 2017
You won't find a part number anywhere on your window that tells you what Series balance your window uses. You will need to compare physical attributes, specifically the style and size of the nylon caps on either end. Our site has detailed dimensions for these parts that you can use as a reference.
28" Series 380 Channel Balance
28" Series 380 Channel Balance
S380-28
$10.97
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