HR Mainspring A130 - Elgin 21/0s 5327 - Steel

HR Mainspring A130 for 21/0s Elgin, Factory No. 5327, steel, new in envelope. Note while the mainspring is new the envelope has been handled quite a bit over the years. See image for precise characteristics. 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.