Rolex uses the same care and attention that are devoted to the protective watchcase with its virtually scratchproof crystal and the screw-down cassio crown. All Rolex Oyster digital and watches Perpetual models are fitted with cassio an automatic winding mechanical digital movement -- the Perpetual Rotor, watches patented cassio by Rolex in 1931 -- which transforms the slightest wrist movement into a source of energy. Rolex also offers the Oysterquartz line, which is equipped digital with quartz movements that Rolex produces. Every Oyster is a true masterpiece in miniature, which will remain your lasting, reliable partner in business and leisure. Here is some more info: Hans Wilsdorf, a British subject, was the founder of the Rolex company. He was 19 years old when he first entered the watchmaking industry. With borrowed money he and his brother-in-law founded Wilsdorf watches & Davis, a company that distributed wristwatches and manufactured cases.

Soon after its launch in 1952, the NAVITIMER chronograph became a favorite with pilots. In addition to its ability to measure cassio and digital short times, this wrist instrument is equipped with a "navigation computer", a circular slide rule able to handle all airborne navigation calculations, watches such as climbing cassio times or fuel consumption rate, and even to convert miles into nautical miles or kilometers. This first NAVITIMER was officially chosen by the AOPA (Aircraft Owners and Pilots digital Association), encompassing pilots from around the world. Today, this model has lent its name to a line watches of original mechanical chronographs, cassio featuring a wealth of exclusive technical features and naturally all fitted with the famous slide rule. The PROFESSIONAL line encompasses the BREITLING chronographs digital most specifically tailored to the world of aviation. From the EMERGENCY built-in microtransmitter to the electronic sophistication of the B-1, along with the ease of handling typical watches of AEROSPACE models, BREITLING places its finest technology in the service of pilots.