Is 28 3 EW CMC 11 my Sash weight

A home owner from Tucson, AZ says:
June 17, 2016
Channel balance stamp is 28 3 EW CMC 11. Is 11 the sash weight?
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Paul from SWISCO responded:
June 20, 2016
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.
28" Series 380 Channel Balance
28" Series 380 Channel Balance
S380-28
$10.97
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