Miracle Power Mainspring for Wittnauer caliber 7TT - 7TR - Steel

Miracle Power No. 1529 steel mainspring for Wittnauer 7TT - 7TR caliber movements and perhaps others, steel, new in envelope. Tongue end. See images for 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.