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Thanks for posting. I'm confident we can help, but that stamp does not tell us the channel balance's identity, but just its strength. To know the identity of the balance you need, we require clear pictures of the nylon fittings or attachments on either end of the metal channel. Removing the balance from the window is the best way to obtain unobstructed pictures. From there we'll do our best to ID what you need. See the videos I've listed on this page that explain how to remove and re-install these balances, as well as how to identify them.