Nivaflex Unbreakable Mainspring N5103 for Felsa 350, 351, 352, PUW 49, Tissot 17.5 - Alloy

Nivaflex Unbreakable mainspring N 5103 for Felsa 350, 351, 352, A. Michel 115, PUW 49, Tissot 17.5  caliber movements 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.