Single Hung Sash Window Balance

I'm not sure what you have, unfortunately. We have dozens of different balances with that stamp. It's not a product code or anything, it just indicates the strength of the spring.

In order to figure out what Series this is, I need you to remove an undamaged version of this balance from the window and show me clear pictures of the top and bottom nylon fittings. I will also need to know the dimensions of these fittings.

With this combination of attachments, you could have either an S380-22 or S385-22 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need 2130 spring strength options for your replacement balances. 

Thank you and let us know if you have any other questions or concerns.

Comparison of the S380 and S385 balance shoes.

I agree, yours is almost definitely the Series 385.

All of our balances come fully assembled and ready to install out of the box. There's no need for you to put anything together.