BESTFIT Mainspring JA118 for 4/0s Elgin No. 4789 - Alloy

BESTFIT Mainspring MS-JA118 for 4/0s Elgin movements, Factory No. 4789, alloy, new in envelope. See images for precise mainspring specifications. 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.