Nivaflex Unbreakable Mainspring N4155 for Bulova 5AH & 5AK - Alloy

Nivaflex Unbreakable mainspring N 4155 for Bulova caliber 5AH & 5AK movements plus perhaps other similar ébauche movements as well, alloy, new in envelope. See images for precise mainspring specifications. 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.