Sandsteel Mainspring - South Bend 16s No. 27528 - Steel

Sandsteel Mainspring for South Bend 16s, Factory No. 27528, 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 is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.