Nivaflex Unbreakable Mainspring N2171 for Fleurier caliber 150 - Alloy

Nivaflex Unbreakable Mainspring N 2171 for Fleurier caliber 150 movements plus perhaps other similar ébauche movements as well, white alloy, new in envelope. See images for precise mainspring specifications. Just a note about the Self Lubricating claim...I'm not convinced especially since all mainsprings should be cleaned thoroughly before installation. 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 suitable job of representing the item.