NuPower Mainspring for Waltham 16s No. 2218 - Steel

NuPower Mainspring for Waltham 16s Model 1888 movements, Factory No. 2218 steel, new in envelope. See images for precise mainspring specifications. 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 job of representing the item.