NuTemper Mainspring #527 for Elgin 4/0s Factory No. 4789 - Steel

NuTemper Mainspring #527 for Elgin 4/0s movements, Factory No, 4789, steel, new in dirty envelope. See image for precise specifications. I specialize is 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.