Replace sash balance for bathroom window

Thanks for posting! This balance appears to be either the S378-15, S380-15, or the S385-15. You'll need to carefully measure the depth of the bottom attachment to confirm the correct replacement series. 

You can likely use the 1450 stamp option but it would be a good idea to confirm that the sash weighs between 13 to 17lbs.

Comparison of the S378, S380 and S385 balance shoes.

That means that the 1450 stamp option is the one you probably need to select when placing the order for the balance. However, your stamp rating could support a different weight range.

The best way to know if you are purchasing the correct option for you window is to weigh the sash it supports.

I hope this helps to provide clarity.