Casey from SWISCO responded:
July 1, 2020
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 2430 and 1520 spring strength options based on the stamp number you've provided. Thank you! Comparison of the S351 and S390 balance shoes.
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