NuRezista Mainspring #565 for Waltham 12s Factory No. 2224A - Steel

NuRezista Mainspring #565 for Waltham 12s, Factory No. 2224A, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.