Bob from SWISCO responded:
January 12, 2021
This looks like either an S351-34 or S390-34. 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. The diagram below illustrates the difference. For a new stamp option, choose 3330. Comparison of the S351 and S390 balance shoes.
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