Nivaflex Unbreakable Mainspring 231L for MST caliber 358, Cimier caliber 180 - Alloy

Nivaflex Unbreakable mainspring 231L for MST (Roamer) caliber 358 & Cimier caliber 180 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.