Marco Mainspring #3141 for Longines Caliber 10.85, 10.68N - Steel

Marco Mainspring #3141 for Longines caliber 10.85, 10.68N movements, and perhaps others, T-end, steel, new in frail 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 so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.