BESTFIT Mainspring JA126 for 15/0s Elgin No. 5550 / 6003 - Alloy

BESTFIT Mainspring MS-JA126 for 15/0s Elgin movements, Factory No. 5550 / 6003, alloy, new in envelope. See images for further details. 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.