Bob from SWISCO responded:
April 11, 2024
Thanks for posting. This looks like either an S351-28 or S390-28 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the measurement from heel-to-toe. See the diagram below for reference. In either case, for a stamp option choose 2730. Let me know if you have further questions. Comparison of the S351 and S390 balance shoes.
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