Window lifts

Thanks for writing in. This is what is known in the window industry as a window balance; specifically, this is a type of window balance called a channel balance. I am afraid the stamp code on the metal channel merely refers to the calibration of the spring inside the balance, not the balance's identity. There are many different types of channel balances, so to know which one you need, we'll need to see pictures of the attachments at either end of the balance. The length of the metal channel, not including those attachments, would also be helpful. Many thanks.