Bob from SWISCO responded:
November 30, 2021
Hello there. This appears to be either an S351-30 or S390-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement seen below, so compare both with your old hardware to see what matches best. For a stamp option choose 2920. Comparison of the S351 and S390 balance shoes.
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