Jurgensen Mainspring #712 for Illinois 18/0s No. 47385 - Steel

Jurgensen Mainspring #712 for Illinois 18/0s movements, Factory No. 47385, steel, new in envelope. See images for further details. I likely have several of these so the actual packaging may differ slightly. 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.