Bob from SWISCO responded:
July 8, 2021
This looks like either an S380-18 or S385-18 Channel Balance. The only difference between each of these channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. The image below depicts the difference. Compare both with your old hardware to see what matches best. For a new stamp option choose 1730. Comparison of the S380 and S385 balance shoes.
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