collection. Watch manufacturing Breguet watches are often easily recognized for their coin-edge cases, guilloché dials and blue pomme hands (often now referred to as 'Breguet hands'). In addition to watches, Breguet also manufactures writing instruments, women's jewelry, and cufflinks. Notable inventions and patents The following are some of the important inventions of Abraham-Louis Breguet and Breguet company. In 1780, invented and produced the world's self-winding/automatic watch (the Perpétuelle). In 1783, invented the Gong-spring, laying the foundation for minute repeaters. In 1783, invented the Breguet hands. In 1790, invented the Pare-chute, one of the world's first shock protection systems. In 1795, invented the Breguet overcoil or Breguet spiral, being widely used in watchmaking industry to this day. In 1801, invented tourbillon, balancing the effect of gravity. In 1810, invented and produced the world's first wristwatch (Breguet No. 2639). In 1830, Breguet produces the first watch wound without a key, equipped with a knurled knob for winding and setting the time. In 1929, created the world's first (possibly) perpetual calendar movement for wristwatches (Breguet No. 2516). In 2010, patented the magnetic pivot, used to improve watch precision using magnetism. In 2010, introduced the magnetic strike governor. Environmental rating In December 2018, World Wide Fund for Nature (WWF) released an official report giving environmental ratings for 15 major watch manufacturers and jewelers in Switzerland. Breguet, along with 7 other manufacturers including Patek Philippe, Audemars Piguet and Rolex, was given the lowest environmental rating as "Latecomers/Non-transparent", suggesting that the manufacturer has taken very few actions addressing the impact of its manufacturing activities on the environment and climate change. There are concerns over the lack of transparency in manufacturing activities and the sourcing of precious raw materials such as gold, which is a major cause of environmental issues such as pollution, soil degradation and deforestation. The situation is especially serious in the developing countries which are top producers of gold, including China, Russia and South Africa. It is estimated that the watch and jewelry sector uses over 50% of world's annual gold production (over 2,000 tons), but in most cases the watch companies are not able to or are unwilling to demonstrate where their raw materials come from and if the material suppliers use eco-friendly sourcing technologies. Notable models Most expensive pieces In May 2012, a Breguet pocket watch, the Breguet & Fils, Paris No.2667, was sold in Christie's Geneva auction with a final price