Rolex Datejust
Overview
 
The Rolex Datejust is an officially certified
Certified chronometer
A certified chronometer is a high-precision watch capable of displaying the seconds and which has been tested and certified by an official neutral body ....

, self-winding
Automatic watch
An automatic or self-winding watch is a mechanical watch, whose mainspring is wound automatically by the natural motion of the wearer's arm, providing energy to run the watch, to make it unnecessary to manually wind the watch. A watch which is not self-winding is called a manual watch...

 chronometer
Chronometer watch
A chronometer watch is a specific type of watch tested and certified to meet certain precision standards. In Switzerland, only timepieces certified by the COSC may use the word 'Chronometer' on them....

 wristwatch manufactured by Rolex
Rolex
Rolex SA is a Swiss watchmaking manufacturer of high-quality, luxury wristwatches. Rolex watches are popularly regarded as status symbols and BusinessWeek magazine ranks Rolex No.71 on its 2007 annual list of the 100 most valuable global brands...

. The Datejust was the first wristwatch with a date function, in 1945.

The Datejust is offered with two classic Rolex
Rolex
Rolex SA is a Swiss watchmaking manufacturer of high-quality, luxury wristwatches. Rolex watches are popularly regarded as status symbols and BusinessWeek magazine ranks Rolex No.71 on its 2007 annual list of the 100 most valuable global brands...

 bracelets: the jubilee and the oyster. The men's bezel size is 36mm. The Thunderbird model or "Turn-O-Graph" was introduced in 1955 as an award given to US Air Force pilots returning from combat missions.
 
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