Bob from SWISCO responded:
February 11, 2024
Thanks for posting. This looks it might be an older version of a Series 140 balance system. Please compare the dimensions listed below to confirm. You have to choose a spring weight for each replacement system you purchase. This designates the weight range they are designed to support. The '5+4' stamp on your coil housing makes me suspect you need the S140-9 9 pound system; but to be safe, weigh the window sash these coil balances support. Give me that exact weight and I can work out what you need. Alternate image for S140-9
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