Bob from SWISCO responded:
March 17, 2024
Thanks for writing in. This looks like it might be either our 351-34 or S390-34. The only difference between these two channel balances is the depth of the bottom nylon shoe, or its measurement from heel to toe. See the diagram below for reference. Compare both with your old balance to see what matches best. In either case for a stamp option choose 3320. Comparison of the S351 and S390 balance shoes.
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