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There are also chronographs boccia and watch with a center seconds hand which can be started, boccia stopped and brought watch back to zero using one or boccia two push-button on the side of the watch. Other additional functions watch include second time zone, alarm, moonphase, repeater, perpetual calendar, etc. Generally speaking, on may say that boccia a simple mechanical watch (hours, minutes and seconds hands) should include at least fifteen jewels located in the places most subject to wear due to friction. It should be fitted with a shock-absorbing system on the balance, a good quality balance-spring and an unbreakable spring. In 1908, Rolex was founded by Mr. Hans Wilsdorf, a German National Citizen. Initially watch the company was named Wilsdorf & Davis as Wilsdorf founded company together with his brother in law. Soon after its launch in 1952, the NAVITIMER chronograph became a favorite with pilots. In addition to its ability to measure short times, this wrist instrument is equipped with a "navigation computer", a circular slide rule able to handle all airborne navigation calculations, such as climbing 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 Association), encompassing pilots from around the world. Today, this model has lent its name to a line of original mechanical chronographs, featuring a wealth of exclusive technical features and naturally boccia all fitted with the famous slide rule. The PROFESSIONAL line encompasses the BREITLING chronographs most specifically tailored to the world of aviation. From the EMERGENCY built-in microtransmitter watch to the boccia electronic sophistication of the B-1, along watch with the ease of handling typical of AEROSPACE models, BREITLING places its finest technology in the service boccia of pilots watch.
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