balance spring from Vector window

A handy person from Delano, Mn. says:
July 14, 2021
I am not able to sent picture. Stamped on spring is 25 4 bsi bt. Can you help with this info. Channel is 1/2 inch, non-tilt.
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Emily from SWISCO responded:
July 19, 2021

Hi there!

I'm afraid we can't identify what you have from this information alone. We'd be happy to help but we'll need you to remove an undamaged balance with the end attachments intact to compare to our inventory. Take a look at the video below, it'll explain exactly what we need to see. 

I know you said you aren't able to send pictures, but is there someone who can help you send in some pictures?
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