KBK Mainspring #3708 for Illinois 16s No. 47316 - Steel

KBK Genuine Factory Mainspring #3708 for Illinois 16s movements, Factory No. 47316, steel, new in envelope. See images for precise mainspring specifications. These are indeed "Genuine Factory" so they would be repackaged, marked, Illinois factory mainsprings for redistribution to jewelers. I specialize is 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.