NuTemper Mainspring No. 166 for Bulova 11WM movements - Steel

NuTemper No. 166 steel mainspring for Bulova caliber 11WM movements, and quite likely others. 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 a pretty good job of representing the item.