Window balance

A handy person from Nampa, ID says:
This is from a non-tilt window. It's 1/2" X 20". Markings on it are 19 4 KP CALDWELL.
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Bob from SWISCO responded:

Thanks for posting. See either our S380-20 or S385-20. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 1940. 

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