Unique 24-F-60

Hi there!

This balance reminds me of our Series 770, though yours is a bit different. The stamp on your metal channel doesn't match any of our standard options so you'll just need to weigh your sash on a scale to determine the appropriate spring strength option. There's a chart on the S770's product page that will show you which option you'll need based on the weight of your sash. If you have any questions just let us know!