sash balance

A handy person from harford county md says:
I removed 2 sash balances from and old Andersen window built in the mid 1970's. I can't make out the windo model type etched on the glass, but I have the old part. On the part are the numbers B224p19/576.
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Emily from SWISCO responded:

Hello!

Take a look at the 24-431 Andersen sash balance which is designed to replace balances that include the stamp code 419, or 4p19. 

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