Channels are 21" long 1/2 wide marked 2020. Unsure of window brand.
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2 Replies
Bob from SWISCO
Aug 10, 2025 9:17 pm
Thanks for posting. This looks like either a S351-21 or S390-21 Channel Balance, depending on the depth of the bottom nylon shoe. See below. For a stamp option choose 2020.
Comparison of the S351 and S390 balance shoes.
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