Tilt window balance ID

A handy person from USA says:
Hi Swisco,

I am repairing a window for a customer that has a unusual balance.

Thanks in advance for any information or help you can provide!!!

It has what appears to be a standard balance. It is 3/8
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Sure, we may be able to help. Some of your post was cut off, though. Can you confirm that the diameter of the outside tube is 3/8"? That is what's used to determine size. Please also give me the length of the outer tube.

See if there is a code or stamp printed somewhere on the tube. That would help us identify a match. Finally, please give me the weight of the sash that this balance supports.
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