HR Mainspring A511 for 10s NY Standard No. 7080 - Steel

HR Mainspring A511 for NY Standard 10s Movements, Factory No. 7080, steel, new in envelope. See image for precise characteristics. 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 an adequate job of representing the item.