KBK Mainspring #3814 for Elgin 16s No. 2542 - Steel

KBK Genuine Factory Mainspring #3814 for Elgin 16s movements, Factory No. 2542, steel, new in envelope. See images for precise specifications. Not very familiar with the supply house (would love to find them in a catalog) and they are indeed "Genuine Factory" so they would be repackaged Elgin factory mainsprings for redistribution to jewelers and they look like a really nice mainspring. 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.