Series 770 Balance Replacement

A quick learner from Balances says:
My existing balances are stamped '2800 BSI LF' Based off that data can you determine what the weight rating is? Weighing the window sash is going to be difficult.
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Tom from SWISCO responded:
I'm afraid I'm not familiar with that stamp. I think weighing the sash is your best bet at this point.
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