KBK Mainspring #3712 for Illinois 16s No. 47326 - Steel

KBK Mainspring #3712 for Illinois 16s movements, Factory No. 47326, steel, new in envelope. See images for precise mainspring specifications. 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.