Longines Factory Mainspring for 13L caliber 13/56 - Steel

Longines Factory Mainspring for 13L caliber 13.56 and numerous similar ébauche movements, T-end, steel, new in open envelope. The wonderful thing about factory mainsprings is they always fit! 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.