channel balnce stamp

A landlord from fort myers florida says:
Hello ,
my channel has a stamp number 28 D AND IS 29 in long I WAS GOING TO PURCHES THE 385 SERIES THIS ONE LOOKS ALMOST THE SAME CAN YOU FIGURE OUT THAT STAMP NUMBER

THANKS
Robert
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Tom from SWISCO responded:
Sure! A stamp of 28 D usually corresponds to our 2840 option, but you might want to weigh your sash just to be sure that's correct.
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