Sandsteel Mainspring for Howard 16s No. 329 - Steel

Sandsteel Mainspring for Howard 16s 17j movements, Factory No. 329, steel, new in envelope. See images for precise specifications. These were available in a couple of different strengths and those that I can supply are shown 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.