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Bob from SWISCO responded:
February 2, 2021
Hi Carsten. Those stamp codes only tell us the calibration of the balances, not their identity. This looks like either a Series 351 or Series 390 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, so compare both with your old hardware to see what matches best. The image below depicts that difference. 
Comparison of the S351 and S390 balance shoes.
Assuming both length balances have the same fittings, for the 31" balances, choose a stamp option of 3020; for the 35" balances, use a stamp option of 3430. |
