The Vacheron Constantin headquarters building in Geneva was designed by Bernard Tschumi, and has been noted for its architectural significance. In October 2005, the Richemont Group named Juan Carlos Torres as the chief executive officer of the company. Currently, the company is an active member of the Federation of the Swiss Watch Industry FH, and produces about 20,000 timepieces per year. Motto and slogan The company motto of Vacheron Constantin is "Faire mieux si possible, ce qui est toujours possible (Do better if possible, and that is always possible)". The motto first appeared in a François Constantin's letter to Jacques-Barthélémy, and the letter was dated July 5, 1819. Watch manufacturing Notable inventions and patents The following are some of the notable achievements of Vacheron Constantin in watch manufacturing. In 1790, created the world's first watch complication. In 1824, created a jumping-hour watch. In 1885, created the first nonmagnetic timepiece which included a complete lever assortment made of materials able to withstand magnetic fields. Its construction included a balance wheel, balance spring and lever shaft that were made of palladium, the lever arms—in bronze and the escape wheel was in gold. In 1901, received the first Geneva Seal (Hallmark of Geneva) for its timepieces. In 1929, created a "Grande Complication" pocket watch, No. 402833, for King Fuad I of Egypt. In 1955, produced the world's thinnest manual-winding movement, the Calibre 1003. In 1992, created the world's thinnest minute repeater, the Calibre 1755. In 2015, created Reference 57260, the most complicated mechanical watch/pocket watch ever made, with 57 complications. Environmental rating In December 2018, World Wide Fund for Nature (WWF) released a report assigning environmental ratings to 15 major watch manufacturers and jewelers in Switzerland. Vacheron Constantin was given an average environmental rating as "Upper Midfield", suggesting that the manufacturer has taken first actions addressing the impact of its manufacturing activities on the environment and climate change. Notable models Most expensive pieces In 1979, Vacheron Constantin made Kallista, one of the most expensive wristwatches in the world. Its initial price was $5 million, but in 2016 the watch was valued at about $11 million. Kallista had 118 emerald-cut diamonds. It took about 6,000 hours for the watch masters to make this watch and about 20 months for jewelers to enrich the watch. On April 3, 2005, the Vacheron Constantin pocket watch Ref. 402833 (1929), which was owned by King Fuad I of