Casey from SWISCO responded:
October 26, 2022
Hi Ryan, With this combination of attachments, you could have either an S380-18 or S385-18 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 You'll also need to weigh your sash to determine which option you'll need since your stamp code is from an outdated weight system. There is a chart on the product page that explains how to choose your option based on the sash weight. 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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