Identifying Window Balance with Stamp 39 9 GW CMC 11

Thanks for posting in our discussion board, Spencer! We will need a bit more information before we can identify an applicable replacement for your balances.

Can you give us the length of the metal channel portion of your balance in inches? Please do not include the attachments in this measurement.

Can you also refer to the following chart and identify which of these bottom shoes matches your own? I can see that yours doesn't have any wings, but the length of the shoe is vital.

Thank you for the information! It appears that your balance would be a Series 390. Unfortunately, I'm a little unsure of the stamp option at this point; 3990 is a bit peculiar for this Series. If at all possible, can you please remove your sash and weigh it? Knowing the weight of the sash will help us determine what stamp option would be best.

Thank you for posting! A Series 390 with a 40" channel and a 3960 stamp option will have to be custom made. With that said, I'll email you a purchase link that you can use to place an order on our website. 

A S390-40 with a 3960 stamp option will carry a window sash weight range of 35 through and including 39 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.