Hi,
I believe the window is a Pella window but the balances appear to be 1/2 x 1/2 channel balances. I couldn't get the window out at the time of the appointment and unfortunately, this customer did not have other operable windows that could be opened to see a good balance. There was as stamp on one balance with 30G on it. The windows are very heavy (each sash 33 1/2" h w/hurricane glass).
Please let me know if you can assist in identifying this balance, balance shoe and hopefully pivot bar.
Thank you
Jack