Marco Mainspring #3123 for Longines Caliber 5.16 (4L) - Steel

Marco Mainspring #3123 for Longines caliber 5.16 or 4L movements, and perhaps others, T-end, steel, new in 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.