Casey from SWISCO responded:
June 1, 2022
Hello, With this combination of attachments, you could have either an S380-26 or S385-26 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need 2520 spring strength options for your replacement balances. I'd recommend double-checking the length making sure that you only include the mental channel and not the end attachments since your stamp indicates that the channel would measure 26". Thank you and let us know if you have any other questions or concerns. Comparison of the S380 and S385 balance shoes.
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