Marco Mainspring #2833 for Meyer-Studeli 340, 381, GP 52, Mido 502, Vulcain 117 - Steel

Marco steel mainspring No.2833 for Meyer-Studeli (MST) caliber 340, 381, Girard Perregaux (GP) caliber 52, Mido caliber 502, Vulcain caliber 117 movements and perhaps others as well, 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.