Tom from SWISCO responded:
July 5, 2017
To start, you can follow our channel balance guide to try to identify the Series of your balance. Judging from your stamp, you need a 28" balance with a 2740 stamp option. You should carefully check both ends of your balance to find a Series that matches yours. You can also send photos of both ends of your balance. We can identify the balance to save you the trouble.
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