If you are new to the world of horology, it is only natural to exchange these terms. ![]() That goes to show the difference between the two, and looking at the 3% number, the difference may be wider than we thought it would be. Unfortunately, only a small fraction (only three percent) of chronographs have been given the chronometer certification. I think it is possible for a chronograph to be a chronometer. These timepieces have been praised for their accuracy in spite the sweeping motion of the second hand. Putting the certifications aside, judging from the descriptions of watches considered as chronometers, these watches sound like mechanical watches, and fairly so. Judging by that, the latter is obviously superior when it comes to standards. Moreover, it can tell time with an accuracy of -2/+2 a day. Basically, this is the same kind of tests, but this time, the timepiece is now cased. On the other hand, Rolex wanted to go a step further and created their own Superlative Chronometer certification. These tests are normally done in Switzerland, and to be officially called a chronometer, the watch should be granted a certification by the Control Officiel Suisse des Chronometres, or simply known as COSC. At best, the watch should be able to tell time with a difference of -4/+6 a day. In addition, the tests are conducted prior to the watch being cased. In order to be called a chronometer, the watch should have passed a series of tests that determines how accurate a timepiece is able to tell time – basically what a watch’s purpose is. It is actually a standard, a compliment to all timepieces. On the other hand, a chronometer is nowhere near a complication. ![]() The crown in the middle functions as usual to set the time. ![]() The top pusher will start and stop the sub-dials, the bottom pusher (located at the four o’clock position) will reset the chronograph hand back to zero. In addition to the sub-dials, a chronograph watch also features two pushers and one central crown. These sub-dials are the chronographs themselves, meaning, the term refers to the complications that are embedded into the watch, and not the watch itself. These sub-dials reflect the hours, the minutes, and the seconds that have passed. Watches that are said to be chronographs sometimes feature sub-dials on their dials. The inner bezel, marked to 24, makes one complete revolution per day.A chronograph is an instrument that is capable of recording time with precise accuracy. The World Time Zone feature has a rotating inner bezel with 24-hour display, part of the watch movement, and an outer bezel, listing the major cities in each of the 24 time zones. Its unique additional hour hand makes one revolution around the dial per day pointing to twelve indicates midnight and pointing to six indicates noon. Introduced by Rolex in the 1950's, this GMT complication is considered a pilot's watch. GMT (Greenwich Mean Time) with Fixed Hour Hand What makes it different is that the regular hour hand is set independently of the 24 hour hand, which completely changes the functionality of the watch. This variety of GMT is a further development of the original. GMT (Greenwich Mean Time) with Independent Hour Hand ![]() The watch displays two or more time zones. In dual time watches, both displays are powered by the same movement. While not technically a complication, the dual movement is a watch that contains two separate movements, each running from their own power source and each set independently. Dual Time Zone complications help determine the time in another time zone.
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