Casey from SWISCO responded:
October 19, 2021
Hello, It looks like you have either our S351-16, with a 15-002 bottom attachment, or S390-16, with a 15-001 bottom attachment. Take a look at the image below to compare to an undamaged balance. You'll also need a 1550 spring strength option for your replacement balances. Thank you! Comparison of the S351 and S390 balance shoes.
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