the change in temperature and signals the main oscillator to compensate. The result was a huge improvement in the watch's accuracy from five seconds per month to five seconds per year. Kinetic watches were introduced by Seiko in 1986 at the Basel Fair Trade Show. These quartz watches use the motion of the wearer's wrist to charge their battery. Grand Seiko 9F quartz movement The 9F quartz movement is used in Grand Seiko quartz watches. The Grand Seiko's 9F quartz movement is assembled entirely by hand by two expert craftsmen. Features include: Backlash auto-adjust mechanism Twin pulse control motor Instant date change mechanism – it can change the date display in 1/2000th of a second Spring Drive The Spring Drive was announced in 1997, developed by Yoshikazu Akahane and his team, and inspired by Yoshikazu's vision: "a watch wound by a mainspring and with one-second-a-day accuracy, a precision that only the finest electronic watches could deliver." The movement achieved high accuracy with one second per day, long power reserve (72 hours) with its unique developed alloy, fast winding with the "Magic Lever" design and glide-motion movement with the watch hands. The movement uses a mainspring as a source of energy and transmits it through a gear train, just like a traditional mechanical watch, but instead of an escapement and balance wheel, Seiko used the newly developed "Tri-synchro regulator," which acts like a quartz movement. The Tri-synchro regulator has three main functions: controlling the mechanical energy of the mainspring, generate electricity for the low consumption (~25 nanowatts) quartz crystal oscillator and generate a magnetic force to regulate the glide wheel. By replacing the traditional escapement with a magnetic brake, the Spring Drive operates with lower noise and presents a glide motion hand that shows the continuous flow of time. The Spring Drive movement was also used as the basis for the first-ever watch designed to be worn by an astronaut during a space walk, the aptly named Seiko Spring Drive Spacewalk. Sponsorships Official timekeeper Seiko has been the official timekeeper of many major sporting events: Olympic Games 1964 Summer Olympics in Tokyo, Japan 1972 Winter Olympics in Sapporo, Japan 1992 Summer Olympics in Barcelona, Spain 1994 Winter Olympics in Lillehammer, Norway 1998 Winter Olympics in Nagano, Japan 2002 Winter Olympics in Salt Lake City, Utah, United States FIFA World Cup 1978 FIFA World Cup in Argentina 1982 FIFA World Cup in