channel balance stamp

A quick learner from canby or says:
I need to order channel balances. The stamp on my channel balance
shows 31 1 b s i r j . I'm not sure
what the sash weight is.

Thank you
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Tom from SWISCO responded:
I see you were looking at our S385-31. Is this the balance you have? If so, I would double check your length. With a stamp of "31 1" your length should be 32" long, not 31" long. If I'm right, I recommend our S385-32 with a 3110 stamp option. You can always weigh your sash on a scale to confirm.
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