Marco Mainspring #711 for 16s N.Y. Standard Factory No. 3196 - Steel

Marco Mainspring #711 for 16s N.Y. Standard, "New Model" Factory No. 3196, T-end, steel, new in 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 and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.