NuPower Mainspring for 6/0s Illinois No. 47370 - Steel

NuPower Mainspring for Illinois 6/0s Movements, Factory No. 47370, steel, new in envelope. See images for precise mainspring specifications. 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 a pretty good job of representing the item.