Marco Mainspring No.641 for Howard 10s #796 - Steel

Marco Mainspring No.641 for Howard 10s movements, Factory No. 796, steel, new in frail envelope. See image for further details. 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.