Springs have an 8 stamped on them.

A handy person from Pennsylvania says:
The sash weighs 13.2 lbs. I need all 4 pieces inside of window slide track.
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Tom from SWISCO responded:

Hello! This looks a lot like our S140-8 coil balance assembly. Look it over and let me know if you agree, or if you had any questions.

s140-8
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