Marco Mainspring No. 5020 for Wittnauer Caliber 11AR, 11ARK Automatic - Steel

Marco steel mainspring No. 5020 for Wittnauer Automatic caliber 11AR, 11ARK as well as AS caliber 1361, 1402, and perhaps others, 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 is 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.