double hung balance spring

Hello, thank you for posting! We would be happy to help you find some replacement balances. However, we carry quite a variety of balance styles and sizes, and therefore would need to see some pictures of your hardware in order to make a recommendation. Take a look at the associated videos to get an idea of our different identification processes. 

Thanks for these follow up pictures! They are exactly what I needed to see. It looks like you will need our S770-35, with the 35C stamp option. Good luck with your repair!