Marco Mainspring #2757 for Gruen 266, 700, 701, 702, 703, 704, 705 - Steel

Marco No. 2757 steel mainspring for Gruen caliber 266, 700, 701, 702, 703, 704, 705 and perhaps others, 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.