Marathon Mainspring #603 for Waltham 0s No. 2228 - Steel

Marathon steel mainspring No. 603 for Waltham 0s movements, Factory No. 2228, 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 a pretty good job of representing the item.