HR Mainspring No. 706 for Font caliber 150, 152 - Steel

HR mainspring No. 706 for Font caliber 150, 152, 166 plus perhaps others as well, steel, new in envelope. See images for further data and 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.