caldwell window balance

A quick learner says:
February 20, 2017
the window balance has stamp on it and the stamp is 19 9 26 el Caldwell. the length is 20 inches. please see attached pictures. I need help with the correct part to order . I need 2 of them
User submitted photos of a window balance.
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Paul from SWISCO responded:
February 23, 2017
Please see our S390-20 channel balance. This appears to be a close match.
A quick learner says:
February 23, 2017
When I try to order this it forces me to chose one of the following 1910, 1920, 1930, 1940. Which one do I select
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Tom from SWISCO responded:
February 27, 2017
Your stamp is a little old fashioned, so I recommend weighing your sash on a scale and referring to the chart on the S390-20 store page to determine the best choice.
20" Series 390 Channel Balance
20" Series 390 Channel Balance
S390-20
$9.38
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