Counterbalance unit

A home owner from Mount Pocono, PA says:
See attached pictures. Small double-hung window probably from 1960s. Balance unit measures 2 3/4" x 6 1/4" x 3/4"

Stampings are C19 6 23 32

User submitted a photo of an Andersen window balance.
Profile picture of Tom
Tom from SWISCO responded:
Check out our 24-637. This can replace Andersen balance boxes stamped with 6 23.
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