Gruen Factory Mainspring for Gruen caliber 455, 457, 459 - steel

Gruen Factory mainspring for calibers 455, 457, 459 and quite likely others, steel, new in open envelope. I likely have several of these so the one you get may differ slightly 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.