NuTemper Mainspring #669 for Illinois 16s Factory No. 47314 - Steel

NuTemper Mainspring #669 for Illinois 16s, Factory No. 47314, steel, new in envelope. See image for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.