Nivaflex Unbreakable Mainspring N6384 for Aurore 233, Blancpain 48, ETA 790, 804 +many more - Alloy

Nivaflex Unbreakable mainspring N 6384 for Aurore 233, Blancpain 48, Cortebert 577, Cupillard 110, ETA 790, 804, Unitas 530 caliber movements plus perhaps other similar ébauche movements as well, alloy, new in envelope. See images for all supported calibers and 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.