Colonial Mainspring for Guren 210, 211, 212 - Steel

Colonial steel mainspring for Gruen calibers 210, 211, 212 and perhaps several others, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ from the images. I specialize in 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.