HR Nivaflex Mainspring G237 for Omega 19.4, ETA 980, Otero 25, Gruen 823 - Alloy

HR Nivaflex Mainspring G307 for Omega 19.4, ETA 980, Otero 25, Lanco 524, Gruen 823 & Benrus AY caliber movements plus perhaps many more similar ébauche watches, white alloy, new in envelope. See images 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 an adequate job of representing the item.