NuVigor Mainspring #178 for Waltham 10s - 14s Colonial A. No. 2234 - Steel

NuVigor Mainspring #178 for Waltham 10s - 14s Colonial A Movements, Factory No. 2234, steel, new in envelope. See image for precise mainspring specifications. The Colonial A series ranged in size from just over 10s to just about 14s (you'll see them shown this way in some materials) but some lazy manufacturers just either didn't put the size or they called them 12s. 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.