Window balance needed

Hello, thank you for posting,

Your balance resembles the Series 770 channel balance. Unfortunately the stamp does not directly translate to our options. To further review, are you able to provide the length of the metal channel along with the weight of the window sash? The sash will need to be removed and placed on a bathroom scale. 

The Series 770 installs with a screw through the top. Can we see a clearer image of the top of your balance? Does it use a S-clip instead like the 19-029 or 19-030 to install into the window channel? Let me know!