Bulova factory Buloloy Insertopak mainspring for caliber 5AD - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 5AD, alloy, new in package. See images for specifications and interchangeability.
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.