But thats the amazing thing: even in the 70s and 80s, all but one piece were mechanical pieces. Its like the quartz crisis has never existed in my story. But in reality, you are obviously right amanico. The last mechanical "best seller" probably was the ellipse in 1968. The beginning and the end of regular production of very complicated pieces like the perpetual calendar also has been in the late 60s, at least when it comes to Patek.