NuREZISTA Mainspring #1507 for Longines caliber 23M - Steel

NuREZISTA mainspring #1507 for Longines 23M movements and perhaps others, steel, 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.