Emily from SWISCO responded:
August 25, 2021
Hello there! With this combination of attachments, you could have either an S380-17 or S385-17 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. For the balance marked "16 4", you'll need a stamp option of 1640. As for the other balance, it looks to be marked "16 3", but it's hard to tell. If you're unsure, you can always weigh your sash on a scale to determine the appropriate stamp option. If you have any further questions just let us know! Comparison of the S380 and S385 balance shoes.
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