There are also chronographs with a center seconds hand which can be started, stopped and brought back to zero using one or two push-button on the side of the watch. Other additional functions include second time zone, alarm, moonphase, repeater, perpetual wedding calendar, etc. Generally speaking, on may say that a simple mechanical watch (hours, minutes and seconds hands) should include at least fifteen jewels located rings 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 the company was named Wilsdorf designs & Davis as Wilsdorf founded company together with his brother in law.

Soon after its launch wedding 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 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 to the electronic sophistication of the B-1, along with the ease rings of handling typical of AEROSPACE designs and wedding models, BREITLING places its finest technology in the service rings of pilots.

TAG Heuer is designs a leading producer of prestigious Swiss wedding sports watches and chronographs sold under one of the world''s most widely recognized luxury brand names.The name "TAG Heuer" rings is instantly recognizable worldwide; undeniably original. It has a personality and a style all of its own. Unconventional, original, fast designs moving - these are just some of the qualities immediately associated with the TAG Heuer brand. Tracing its roots to a workshop founded in 1860 by Edouard Heuer, TAG Heuer has a long tradition wedding of technological rings innovation in precision timepieces, including stopwatches and water-resistant watches Reflecting this heritage, the TAG Heuer brand has long been designs closely associated with the world of competitive sports,