SWISCO - The Replacement Hardware Authority

Sash weight range?

A home owner from California says:
Hello: my balance is stamped "13:10:59 05\18\04 UNIQUE BALANCE 29B". How do I find out the sash weight range option? Thank you.
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Tom from SWISCO responded:
A stamp of "29B" usually corresponds to our 2920 option, but you can always weigh your sash to confirm.
A home owner from California says:
OK great. Thank you.
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