Sash Support Andersen Window Balance

Home Owner from PA
Please, could you help me to identify Sash Support Andersen Window Balance - c39 6#23 3-78 - these are the only markings I found on the sash box. House built in 1978.
2 Replies
Tom
Tom from SWISCO
SWISCO
Expert
I think you should check out our 24-637. This can replace balance boxes with the stamp 6#23.
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