I have 4 springs I need to replace. I think the balance spring looks closest to S795, except it has a hook at the top instead of a screw clip.
To describe it more fully: The metal channel is stamped 27C, then a sideways B.S.I., then something that looks sort of like the letter P, only the verticle line of the P is really thin, then the letter F. The block and tackle is toward the top, and the spring toward the bottom. The channel is plain, not ribbed, and is about 9/16" x 9/16". There is a 1/4" wide sheet metal hook at the top, tied to the string. The shoes looks like 15-195.
Thanks for your help!
Wayne