Nivaflex Unbreakable Mainspring N7420 for Peseux 40, 40A, 41 - Alloy

Nivaflex Unbreakable Mainspring N 7420 for Peseux caliber 40, 40A, 41 movements plus perhaps similar ébauche watches, white alloy, new in envelope.  See image for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. I specialize is 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.