HR Ev-R-Last Mainspring E319 for Kurth 200, Kasper 500, Helvetia 105, Bulova 3AF - Steel

HR Ev-R-Last Mainspring E319 for Kurth 200, Kasper 500, Helvetia 105, Bulova 3AF caliber movements plus perhaps many more similar ébauche watches, steel, new in envelope. See image for precise characteristics. 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.