Bulova factory Buloloy Insertopak mainspring for caliber 10AK, 10BH, 10BM - Alloy

Bulova factory Buloloy Insertopak mainspring for caliber 10AK, 10BH, 10BM, 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 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.