Bob from SWISCO responded:
July 29, 2021
Good deduction. I do think the S380-27 is likely what you need. The only other possible is the S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the image below to help you determine. In either case, use 2640 as a stamp option. Comparison of the S380 and S385 balance shoes.
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