Bulova factory Buloloy Insertopak mainspring for caliber 7AK - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 7AK, alloy, new in package. See images for specifications and interchangeability. The wonderful thing about factory mainsprings is they always fit. 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.