Swisscraft Mainspring A-108 for 4/0s Elgin No. 4789 - Steel

Swisscraft Mainspring A-108 for Elgin 4/0s Movements, Factory No. 4789, steel, new in envelope. See images for 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.