Bob from SWISCO responded:
September 29, 2023
Thanks for posting. This looks like either an S351-15 or S390-15 to me. The difference between these two balances is the depth of the bottom nylon shoe, or its 'heel-to-toe' measurement. See the image below for reference. Measure the depth of your old balance's shoe to see which replacement matches best. In either case, for a new stamp option, choose 1420. Let me know if you have any other issues. Comparison of the S351 and S390 balance shoes.
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