HR Nivastar Mainspring G259A for Gruen caliber 405, 410, 420, 425 - Alloy

HR Nivastar Mainspring G259A Mainspring for Gruen caliber 405, 410, 420, 425 movements plus perhaps others as well, alloy, new in envelope. See images for precise mainspring specifications. 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 a pretty good job of representing the item.