channel balance stamp

A handy person from Bradenton FL says:
September 6, 2016
I have found a 29" series 380 channel balance on your site that appears to be a close
match for an existing channel balance that I have. The existing balance is stamped:
"28B USB". Does this provide you with any useful information on the appropriate sash weight range in LBS to select?

Thanks,

David
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Tom from SWISCO responded:
September 7, 2016
Hey, David. It sure does. A stamp of 28B usually corresponds to our 2820 option. That said, you can always weigh your sash on a scale to be 100% sure.
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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