Nivaflex Mainspring for 12s N.Y. Standard Factory No. 4144 - Alloy

Nivaflex Mainspring for New York Standard 12s Movements, Factory No. 4144, T end, 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.