What coil balance is for which window sash weight?

A quick learner says:
How do you know which balance is for which window weight?
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Donna from SWISCO responded:
For the Series 190 coils they are stamped with the number needed. If you do not have any numbers lightly stamped on your existing coil you may need the Series 152. Here is a guide on how to select the proper weight coil for the Series 152:
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S190-440 : 440 S190 Coil Balance Spring
S190-440
Price: $9.89
440 S190 Coil Balance Spring
How to choose the appropriate coil balance strength
Guide
How to choose the appropriate coil balan...