Jasmine from SWISCO responded:
May 1, 2023
Thanks for writing in. Your channel balances appear to be our S351-23 or our S390-23 balance with a 2220 stamp. To determine which series you have, you'll need to confirm the dimensions for the depth of your bottom shoe. Take a look at the diagram below to confirm. Comparison of the S351 and S390 balance shoes.
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