Lot of 3 Nervinca Unbreakable Mainspring for Longines 4LL - Alloy

Three Nervinca Unbreakable mainsprings for Longines caliber 4LL plus perhaps similar ébauche movements as well, alloy, new in case. See images for precise mainspring specifications. 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.