Bob from SWISCO responded:
July 30, 2023
Hello there. It looks like you have either the S390-17 or S351-17. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the illustration below. Compare both with your old hardware to determine which you need. In either case, for a new stamp option choose 1620. Comparison of the S351 and S390 balance shoes.
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