Paul from SWISCO responded:
February 23, 2015
Hello! The difference between the Series 390 and Series 351 is the size of the shoes. I recommend that you compare the dimensions of those two SWISCO balances to your own to determine which is a closer match.
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Paul from SWISCO responded:
February 26, 2015
Ah, I see. In that case, I think you'd be okay with the S351-29, which has the smaller shoe.
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