Sandsteel Mainspring for Waltham 12s movements No. 2224A - Steel

Sandsteel Mainspring for 12s Waltham Factory No. 2224A, 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 a pretty good job of representing the item.