Newall SUPER Security #783 Mainspring for Illinois 6/0s Factory No. 47370 - Alloy

Newall SUPER Security Mainspring #783 for Illinois 6/0s movements, Factory No 47370, alloy, 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 in hard to find watch parts and all watch parts are unconditionally guaranteed, even the cheap ones. Images do a pretty good job of representing the item.