HR Mainspring No. 629A for MST caliber 291 - Steel

HR Mainspring No. 629A for MST (Meyer & Studeli) caliber 291 movements plus perhaps other ones as well, steel, new in frail envelope. See images for further data and 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.