Marco Mainspring No. 3350 for Landeron Caliber 47 Chronograph - Steel

C&E Marshall Mainspring No. 3350 for Landeron caliber 47 Chronograph, steel, new in envelope. My notes say this also fits caliber 46, 48, 49 & 50 as well as several other chronograph models. 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.