Wittnauer Factory Mainspring for caliber 5S, 5W - Steel

Wittnauer Factory Mainspring caliber 5S, 5W plus perhaps similar ébauche watches, T-end, steel, new in envelope. 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.