Marco Mainspring #2864 for GSW 23.7-4, Excelsior Park 5C, 51C, Gruen 627, Tissot 782 - Steel

Marco Mainspring No. 2864 for Excelsior Park 5C, 51C, Gruen 627, Geneva Sport 23.7-4, Tissot 782 caliber movements, and perhaps others, steel, new in envelope. See images for precise mainspring specifications. 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.