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Emily from SWISCO responded:
February 21, 2022
Hello! With this combination of attachments, you could have either an S380-29 or S385-29 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. Your 28C stamp may correspond to our 2830 spring strength option but you can always weigh your sash on a scale and refer to the chart under the product description on the S380 and S385 store pages to determine the appropriate spring strength option for your balance. 
Comparison of the S380 and S385 balance shoes.
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