Nivaflex Mainspring for 12s Hamilton No. 1228 / 718071 - Alloy

Nivaflex Mainspring for Hamilton 12s Movements, Factory No. 1228 / 718071, alloy, 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 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.