Marco Mainspring #2930 for Cortebert caliber 601, MST caliber 315 - Steel

Marco Mainspring No. 2930 for Cortebert caliber 601, Meyer & Studeli caliber 315 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.