Tilt window balance

A quick learner from Nashua NH says:

No markings. Rod is 21 inches long. There is no metal channel. Window sash weighs 14 lbs

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Bob from SWISCO responded:

This old rod balance isn't made anymore, but you should be able to replace it with a Series 775 Channel Balance. If the rod is 21" long, then see our S775-21 . A window sash that weighs 14 lbs should work with our 21B stamp option--measure the shoe size to confirm if you need a 1" or 1-1/4" replacement. Let me know if you have any other questions. 

How to install a S775 balance
How to install a S775 balance
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