Marco Mainspring #3339 for Wittnauer Caliber 10TN - Steel

Marco steel mainspring #3339 for Wittnauer caliber 10TN 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.