Channel Balance weight

A handy person from Temecula, CA says:
I would like to order the 27" Series 385 Channel Balance
Product Code: S385-27 with 19-005 top attached and 15-004 Shoe attached but don't know what is the weight of the sash. There is a print on the back of the channel 26 4 BX CMC 7. The channel measures 27" long, 1/2" wide and 5/8" depth. Also the top and the shoe measurements are the same as shown in your pictures.
Please let me know what is the sash weight I should use.
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Tom from SWISCO responded:
A stamp of "26 4" usually corresponds to our 2640 option, but you could always weigh your sash on a scale to confirm.
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