Temp-Rite Mainspring for Illinois 16s 60hr No. 47309 - Steel

Temp-Rite Mainspring for Illinois 16s 60hr Motor Barrel movements, Factory No. 47309, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.