PM Merelloy Mainspring for Elgin 21/0s movements No. 6004 - Alloy

PM Merelloy Mainspring for Elgin 21/0s movements, Factory No. 6004, alloy, new in envelope. See images for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.