Nivaflex Unbreakable Mainspring for ETA 2821 Automatic - Alloy

Nivaflex Unbreakable mainspring for ETA 2821 caliber automatic movement and numerous variations, plus perhaps other similar ébauche movements as well, alloy, new in sealed package. See images for further details and precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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 an adequate job of representing the item.