stamp number

A quick learner from Idaho says:
May 11, 2017
My guide is a 27" non tilt window balance block and tackle stamp 26-4. My question is: is the 26-4 stamp the same as 2640?
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Tom from SWISCO responded:
May 16, 2017
Yep, the 26-4 usually corresponds to our 2640 option. You can always way your sash to confirm, too.
27" Series 351 Channel Balance
27" Series 351 Channel Balance
S351-27
$10.77
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