NuTemper Mainspring #658 for Howard 12s Factory No. 552 - Steel

NuTemper Mainspring #658 for Howard 12s movements, Factory No. 552, steel, new in envelope. See images 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.