Nivaflex Unbreakable Mainspring for Buren 355, 356, 357, 358 & Kurth 270, 275 - Alloy

Nivaflex Unbreakable mainspring N7154 for Buren 355, 356, 357, 358, Kurth 270, 275, Peseux 220, Felsa 296, 298 plus perhaps other similar ébauche movements as well, 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.