Window balance from 1880 window, no visible names etc

A home owner from Maine /NH says:

Looking for some type of replacement for this part. Any ideas?

Thank

Patti and Steve

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Bob from SWISCO responded:

We've have success replacing balances on old wood windows with our Series 500 Spiral Balance. You could use this in conjunction with the 17-012 or 17-007 bracket. Look these parts over and see if you think they could work for you.

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