Newall Unbreakable Mainspring 1609N for Font 180, Bulova 8AE, Unitas 540, 541 - Alloy

Newall N-Dur-All Mainspring 1609N for Font 180, Bulova 8AE, Unitas 540, 541 caliber 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.