HR Mainspring No. 929 for Landeron caliber 15, 16, 39, 52, 53 Chronographs - Steel

HR No. 929 steel mainspring for Landeron caliber 15, 16, 39, 52, 53 Chronographs and quite possible others, new in envelope. See images for precise calibers supported and 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.