Dynaflex Unbreakable Mainspring for AS caliber 1215, 1290 - Alloy

Dynaflex Unbreakable Mainspring for AS caliber 1215, 1290 movements plus perhaps other's as well, alloy, new in envelope. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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.