Emily from SWISCO responded:
November 12, 2021
Hello! With this combination of attachments, you could have either an S380-27 or S385-27 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. A 26D stamp usually corresponds to our 2640 stamp option, but you can always weigh your sash on a scale and refer to the charts on the S380 and S385's store pages to be 100% sure. If you have any questions just let us know! Comparison of the S380 and S385 balance shoes.
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