Upper balance on peachtree windows

Thanks for posting. If the metal channel length is 20-1/4", then I believe you might need our S745-20 Peachtree Balance. Look it over and see if you agree. Now, the stamp code tell us the strength of the balance. Your balance's stamp is definitely a little unusual, but what you can do is obtain the exact weight of the window sash. Obtain that exact weight--if it's 13 through 17 pounds, use a new stamp option of 19.25-4. If it's somewhere in the range of 22 through 26 pounds, use a stamp of 19.25-9. Let me know if you have further questions.