Nivaflex Unbreakable Mainspring for ETA 1240, Eterna 1244, Benrus BN - Alloy

Nivaflex Unbreakable Mainspring for ETA caliber 1240, Eterna caliber 1244 and Benrus caliber BN movements, white 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.