HR Mainspring SA402 for Illinois 18s Factory No. 47302 - Alloy

HR Mainspring SA402 for Illinois 18s, factory No. 47302, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item