Gruen Factory Steel Mainspring for caliber 460, 462, 470 & 475 movements

Gruen Precision factory mainspring for calibers 460, 462, 470 & 475 movements, and quite likely others, steel, new in envelope. See images for precise mainspring specifications. Proper installation requires the use of a slip spring - which are usually fine to re-use - so it is not included. 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.