Alloy Mainspring for Concord 241W, 242W, Pierce 100 - 103

Unmarked Maker Swiss Mainspring for Concord caliber 241W, 242W and Pierce 100, 101, 102, 103, 103C movements plus perhaps similar ébauche watches, white 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 a pretty good job of representing the item.