5#23 Anderson Sash Balance

A quick learner from Maryland says:
I need to replace an Anderson sash balance having the following stamps:

Stamps on Cover:
US Pat 3,335,455

Stamps on body (coil springs are attached this)
B J9 5#23 3-87

Do you have a compatible part?

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Tom from SWISCO responded:
Thanks for posting. Check out our 24-531 Andersen Sash Balance. This can replace balance boxes with the stamp 5#23.
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