Bob from SWISCO responded:
August 4, 2021
This looks like either an S351-33 or S390-33 Channel Balance. 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 3250. Comparison of the S351 and S390 balance shoes.
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