Sandsteel Mainspring for Howard 12s #553 - Steel

Sandsteel Mainspring for Howard 12s movements, Factory No. 553, steel, new in envelope. See image for precise specifications. These were available in several different strengths and those that I can supply can be found in the drop-down list. 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.