Bob from SWISCO responded:
December 31, 2023
Thanks for posting. This looks like either an S351-28 or S390-28. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the image below. Compare both with your old hardware to see what matches best. In either case for a stamp option go with 2730. Comparison of the S380 and S385 balance shoes.
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