HR Nivastar Mainspring G419 for Cortebert caliber 635 - Alloy

HR Nivastar Mainspring G419 for Cortebert caliber 635 plus perhaps similar ébauche movements, 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.