Jasmine from SWISCO responded:
April 4, 2024
Thanks for posting! Your coil balance assembly resembles our Series 140 Quick-Tilt balance. I did notice that the cover appears to be stamped with a 10 which would be replaced with the S140-10. However, if you are going by the sash weight you've confirmed, you'll need to the S140-9. Be sure to carefully review and compare the dimensions below to confirm that this assembly will be a fit for your window. Alternate image for S140-10
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