USR Mainspring for N.Y. Standard 16s No. 3196 - Steel

USR Mainspring for N.Y. Standard 16s movements, Factory No. 3196, T end, steel, new in envelope. These came as both HOLE end and T end so make sure you're getting the one that's correct for your movement. 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 suitable job of representing the item