Nivaflex Unbreakable Mainspring NA846 for Bulova 9AB, 9ABC, 10AU, 10AUC - Alloy

Nivaflex Unbreakable Mainspring NA 846 for Bulova caliber 9AB, 9ABC, 10AU, 10AUC & Felsa caliber 700, 705 automatic movements, plus perhaps others as well, white alloy with attached bridle, new in envelope.  See image for precise mainspring specifications and further helpful information. 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 a pretty good job of representing the item.