Nivaflex Unbreakable Mainspring #150½ for Bulova 7AA, 7AH, 7AK, 7AN, 7AP - Alloy

Nivaflex Unbreakable mainspring 150½ for Bulova caliber 7AH, 7AK, 7AP & ETA caliber 735, 737 movements plus perhaps other similar ébauche movements as well, alloy, new in envelope. See images for further data and 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.