Nivaflex Mainspring for 16s South Bend No. 17528 - Alloy

Nivaflex Mainspring for 16s South Bend movements, Factory No. 17528, alloy, new envelope. See images for precise mainspring specifications. 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 an adequate job of representing the item.