Wittnauer Factory Mainspring for caliber 7TN - Alloy

Wittnauer Factory Unbreakable Mainspring caliber 7TN plus perhaps similar ébauche watches, alloy, new in 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 an adequate job of representing the item.