Window channel balance

Thanks for posting. I'm not certain about this balance's identity, but I'm forwarding this discussion to one of my senior colleagues, and we'll get back to you as soon as we can with more information. Can you just confirm the stamp code on the metal channel? Many thanks. 

Thanks for bearing with me. This is a very old Pan Am Window Balance. I believe I know what you need, but I'm verifying one detail with a senior colleague to be absolutely certain. I will get back to you as soon as possible. Apologies for the wait, and thanks for your patience. 

Thanks for your patience. I just sent you an email with a custom link enclosed to order (2) 13" channel balances, with the 15-007 Bottom and 19-035 Top Fittings attached. This balance will have a stamp code of 1210, which is for a sash that weighs 3 through 6 pounds. Let me know if this all seems good to you, or if you have any other questions prior to placing your order. Many thanks.