Nivaflex Unbreakable Mainspring N2208 for Bulova 4AK, 4AL, 5AP, 5P, ETA 511, 670 - Alloy

Nivaflex Unbreakable mainspring N 2208 for A. Michael 82, 613, 617, Bulova 4AK, 4AL, 5AP, 5P, ETA 511, 670, Gruen 106, 306, 686 caliber 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 an adequate job of representing the item.