Emily from SWISCO responded:
March 13, 2024
Hello there! Thank you for reaching out to us. It looks like you may have the S380-28 or S385-28 channel balance. The best fit will depend on the depth of the bottom fitting as shown below. Your stamp is a bit faded but it looks like it might've been 27-2. With that in mind and the fact that your sash weighs 10.4 pounds, you can use the 2720 stamp option for your replacements. A pair of balances with this stamp can support a sash weighing 9 to 13 pounds. Comparison of the S380 and S385 balance shoes.
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