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

Marco No. 2757 steel mainspring for AS 922, 1280, 1287, MST 352, 371, Gruen 266, 700, 701, 702, 703, 704, 705 caliber movements and perhaps others, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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.