NuRezista Mainspring #666 for Illinois 18s Factory No. 47302 - Steel

NuRezista Mainspring #666 for Illinois 18s movements, Factory No. 47302, steel, new in envelope. See image for further details and 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