Marco Mainspring #3092 for Wittnauer 10T, 10TS, 52, ETA 865, 871, FEF 170, Rolex 10½H - Steel

Marco Mainspring No. 3092 for Wittnauer caliber 10T, 10TS, 56, ETA caliber 865, 871, Girard Perregaux caliber 86, Fleurier caliber 170,  Rolex caliber 10½ ligne size H movements plus perhaps similar ébauche watches, steel, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is 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.