Marco Mainspring #2979 for Felsa caliber 40, Matter caliber 109 - Steel

Marco Mainspring No. 2979 for Felsa 40, Matter 109 caliber movements, plus 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.