window balance

Thanks for posting. I am confident we can help replace this channel balance, but that stamp code is not an identifier; it just tells us the strength of the balance. To know the right replacement, we need to see pictures of the nylon attachments or fittings on both ends of the metal channel. The combination of fittings determines what kind of balance it is. See the videos on this page that detail how to remove and replace channel balances, as well as details on identification. If you can get us those pictures of the attachments, we should be able to narrow this down.