NuVigor Mainspring No. 77 for Bulova caliber 9B, 10AL- Steel

NuVigor No. 77 mainspring for Bulova caliber 9B, 10AL 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.