E&H Mainspring for Hamilton 0s No. 1536 - Steel

E&H Mainspring for Hamilton 0s Movements, Factory No. 1536, steel, new in envelope. See image for further details. These measure right about .14 thick. 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.