Bob from SWISCO responded:
October 22, 2023
Thanks for posting. You are correct, this looks to be either an S380-21 or S385-21. The difference between these two balances is the depth of the bottom nylon shoe, or its 'heel-to-toe' measurement. See the illustration below. Measure the depth of your balance's shoe to figure out which Series you need. In either case for a stamp option choose 2040. Comparison of the S380 and S385 balance shoes.
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