Bob from SWISCO responded:
March 17, 2024
Hey Miguel. Thanks for all the thorough information, it's appreciated. This looks like an S351-28 Channel Balance, with a stamp option of 2720. I would just double-check the bottom shoe depth just to be safe. If it's 1", then this is definitely a Series 351; but if it's 1-1/8", you need the Series 390 instead. Judging from the photo I agree it's most likely 1", but pictures of measuring tape sometimes can be misleading, so just double-check to be safe. Let me know if you have further questions. Comparison of the S351 and S390 balance shoes.
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