Window spring balance

A handy person from Los Angeles CA says:
September 6, 2022
Hello there .
The only Marking there is on the WB is 7 lb

The window is small double hung window 30" x 36"
Thank you
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Emily from SWISCO responded:
September 8, 2022

Hi there!

The balance assembly you show here looks like a match for our S140-7. Look over our specifications and see if you agree. 
7 lb Series 140 Quick-Tilt, Single
7 lb Series 140 Quick-Tilt, Single
S140-07
$7.97
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