Bulova factory Buloloy Insertopak mainspring for caliber 10BNCH - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 10BNCH, alloy, new in package. See images for further details. The wonderful thing about factory mainsprings is they always fit. I likely have several of theses 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.