Bob from SWISCO responded:
November 5, 2020
Thanks for writing in. This looks like either an S380-29 or S385-29 to me. 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 picture below illustrates this difference. In either case, you'll need a stamp option of 2820. Comparison of the S380 and S385 balance shoes.
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