Carl F. Bucherer Patravi AutoDate TwoTone - Ludacris - Fast & Furious 6
The watch seen in the film is the Carl F. Bucherer Patravi AutoDate TwoTone, reference number 00.10617.07.23.21, in steel and 18k rose gold.
After buying all the cars at an auction, Ludacris asks the man responsible for the auction to give him his watch - "I like that watch". When he gets the watch and puts it on, he shows it to Luke Hobbs (played by Dwayne Johnson) giving the Bucherer watch a fullscreen product placement shot for two seconds. The watch can be seen at approx. 42 minutes into the movie.
Read more about the watch and find retailers on the official Carl F. Bucherer website.