window channel balance

A home owner from portland or. says:
need a balance for a window that lifts up, the metal on it is 11" long. On the side it reads 10 9 EP CALDWELL.

Thank you, Connie
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Tom from SWISCO responded:
I'm afraid I cannot identify what you have based on that stamp, but we may still be able to help. Can you show me a picture of both ends of the metal channel? I'd like to see the nylon attachments. Can you also tell me the weight of the sash your balances support?
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