WATCH-CRAFT Mainspring 3831W for Calvert 107L, 155L, Cort 447, Dunegna 772, Eberhard 775, Glycine 57 - Alloy

WATCH-CRAFT Mainspring 3831W for Calvert 107L, 155L, Cortebert 447, Dunegna 772, Eberhard 775, Glycine 57, Wyler 120 caliber movements, and perhaps others, white alloy, 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 a pretty good job of representing the item.