Need help determing if this is a Series 380 or 385




Thank you for reaching out to us. I agree that either the S380-13 or S385-13 would be what you need. However, I'm afraid I can't confirm which one you may need from photos. It's hard to make out accurate dimensions from photos alone. With that said you will have to measure as shown below and use your best judgment.
We usually recommend sticking with the stamp that your old balance was designed to use. However, if you've been having trouble opening and closing the window then we recommend weighing the sash on a scale to confirm the proper stamp option.





It's my pleasure to help. We truly appreciate your business! Let me know if I can be of further assistance and best of luck with the repair!