NuTemper Mainspring for Illinois 6/0s No. 47363 - Steel

NuTemper Mainspring No. 698 for Illinois 6/0s movements, Factory No. 47363 steel, new in a very frail envelope. See image for further details. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.