Howard 12s Mainspring No. 552 Made by Waltham - Steel

Howard Mainspring for 12s, Factory No. 552, hole end, made by Waltham, steel, new in envelope. This is not the first time I've run across a mainspring that Waltham made for a competing brand. These were available in a couple of 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 an adequate but perhaps incomplete job of representing the item.