Bob from SWISCO responded:
June 10, 2021
This appears to be either a S351-35 or S390-35. The only difference between these two balances is the depth of the bottom nylon shoe, or the "heel-to-toe" measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 3430. Comparison of the S351 and S390 balance shoes.
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