Longines Factory Mainspring for caliber 8LN, 8/68N - Steel

Longines Factory Mainspring for calibers 8LN and 8/68N and perhaps others, steel, new in open packaging. Longines had the practice of calling their steel mainsprings unbreakable as well, but these are not alloy mainspring. 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 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.