Window balance

A handy person from Temecula, Ca says:
It is metal portion is 15". The channel is 1/2". There are no markings or stamps on it.
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Bob from SWISCO responded:

Hi there. If the metal channel, not including the end attachments, is 15", then see our S395-15. If there is no stamp code on the balance, you'll need to weigh the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the S395-15 product page. Let us know if you have any questions.

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