Bulova factory Buloloy Insertopak mainspring for caliber 5AT - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 5AT, alloy, new in package. The wonderful thing about factory mainsprings is they always fit. I likely have several of these so the one you get may differ 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 satisfactory job of representing the item.