HR Nivastar Mainspring G259 for Gruen 335, 405, Baumgartner 910, 916 - Alloy

HR Nivastar Mainspring G259A Mainspring for Gruen caliber 335, 405, Baumgartner (BFG) caliber 910, 916 movements plus possibly several others, 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.