Marco Mainspring #2779 for Tavannes caliber 719 to 779 - Steel

Marco steel mainspring No.2779 for Tavannes 17 ligne caliber 719, 758, 764, 768, 774, 777, 778, 779 movements and perhaps others, 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.