Andersen balance from 1984ish

Hello,

It looks like your Andersen sash balance is stamped with 9# 3 but I can't quite make out the next number. I suspect that you may need the 24-939 replacement but I'd recommend checking the balance on the other side of the header to confirm if if matches one of the stamp codes supported by this balance. Thank you! 

Unorutnately, those stamps do not indicate the correct replacement. The 9#3 portion of the stamp is what you would need to check on another balance to determine if it matches one of the codes the 24-939 will support.