Newall Security Mainspring #703 for Howard 16s Factory No. 329 - Steel

Newall Security Mainspring #703 for Howard 16s movements, Factory No. 329, steel, new in frail envelope. See images for further details. I likely have several of these so the one you get may differ slightly forom 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.