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Casey from SWISCO responded:
January 23, 2023
Hello, It looks like you have either our S351-34, with a 15-002 bottom attachment, or S390-34, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. It's hard to make out in your photo but if the stamp reads 33 3, then you'll also need a 3330 spring strength option for your replacement balances. Thank you! 
Comparison of the S351 and S390 balance shoes.
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