Casey from SWISCO responded:
February 23, 2021
Hello, It looks like you have either our S351, with a 15-002 bottom attachment, or S390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. You'll also need to locate the stamp number on your metal channel to choose the correct spring strength option for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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