Excelsior #2857 Mainspring for Angelus Travel Clock caliber 240 - TIME side

Excelsior Mainspring No. 2857 for Angelus Travel Clock. For TIME side - Caliber 240 and perhaps others as well, steel, new in envelope. See images for precise mainspring specifications.  I likely have several of these so the one you get may differ slightly from the images. I specialize in parts for all forms of vintage watches and clocks and all are sold with an unconditional guarantee.  Images to a suitable job of representing the item.