Swartchild Black Shield Mainspring #44128 for Howard 10s Factory No. 796 - Steel

Swartchild Black Shield Mainspring #44218 for Howard 10s, Factory No. 796, steel. See images for for further information. 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.