Comsco Mainspring #1158 for Illinois 6s & 4s movements Factory No. 47354 - Steel

Comsco Mainspring #1158 for Illinois 6s and 4s movements Factory No. 47354, Steel. See image 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. Images do a pretty good job of representing the item.