Bob from SWISCO responded:
October 22, 2023
Hello there. This appears to be 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. Compare both with your old hardware to see what matches best. In either case for a new stamp option go with 2740. Comparison of the S351 and S390 balance shoes.
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