Longines Factory Mainspring for caliber 5L - Alloy

Longines Factory Mainspring for caliber 5L plus perhaps similar ébauche watches, alloy, new in sealed envelope. The wonderful thing about factory mainsprings is they always fit! 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.