I need to buy 6 balances 2930x photos included

A quick learner from Coloray says:
Please if possible identify replacement parts
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Bob from SWISCO responded:

This balance looks like either an S351-30 or S390-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the image below.

That stamp simply tells us the strength of the balance, not its identity. So for your new balance, choose stamp option 2930. 

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