Nivaflex Mainspring for Elgin 21/0s No. 5327 / 6004 - Alloy

Nivaflex Mainspring for 21/0s Elgin, Factory No. 5327 / 6004, 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.