SWISCO - The Replacement Hardware Authority

Is 28 3 EW CMC 11 my Sash weight

A home owner from Tucson, AZ says:
Channel balance stamp is 28 3 EW CMC 11. Is 11 the sash weight?
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Paul from SWISCO responded:
This stamp corresponds to your sash weight, but it is not the sash weight itself. The key numbers here are "28 3," which matches out 2830 option. Two balances with a 2830 option can carry a sash weight of 16 through 23 pounds.
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