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

Marco No. 5020 steel mainspring 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.