South Bend Mainspring for 18s No. 19528 (EXACT) - Alloy

South Bend EXACT Mainspring for 18s movements, Factory No. 19528, SWISS White Alloy (unbreakable, rustless), new in envelope. See image for precise characteristics. I specialize is 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.