Nivaflex Unbreakable Mainspring for Bulova 10AP, 10P, Benrus AR, AT Cort 640 - Alloy

Nivaflex Unbreakable mainspring N5344 for Bulova 10AP, 10P, Benrus AR, AT Cortebert 640, AS 864, and Font 28, 175, 179, 186, 205, 281 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.