Casey from SWISCO responded:
July 27, 2020
Hello, With this combination of attachments, you could have either an S380-34 or S385-34 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. I agree that your stamp is a bit out of the norm but you can weigh your sash and follow the chart under our balance product descriptions to choose the correct spring strength option for your balances. 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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