HR Mainspring A120 - Elgin 5/0s & 6/0 Factory No. 2890 - Steel

HR Mainspring A120 for 5/0s & 6/0 Elgin, Factory No. 2890, steel, new in envelope. See images for precise 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 an adequate job of representing the item.