Marathon Mainspring #535 for Bulova 10BL, 10ZL, Felsa 335, 336 - Steel

Marathon steel mainspring No. 535 for Bulova 10BL, 10ZL, Felsa 335, 336 caliber movements plus perhaps other similar ébauche wrist watches. See images for precise mainspring specifications. 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.