Marco Mainspring #2749 for Felsa 335, Tissot 17.5SC, Rolex NA (620 / 630), Bulova 10BL - Steel

Marco Mainspring #2749 for Felsa 335, Tissot 17.5 SC, Rolex 11½ ligne NA Ref 620 / 630, Bulova 10BL, Westfield 10ZL caliber 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 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.