Omega Factory Mainspring for caliber 140 - Steel

Omega Factory Mainspring for caliber 140 movements in open factory packaging, steel. While they do say Rustproof I'm not sure how they figured that since it is a steel mainspring. The wonderful thing about factory mainsprings is they always fit! 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 a pretty good job of representing the item.