He has been spotted wearing:
* Rolex: He's often seen sporting a classic Rolex Submariner.
* Omega: He has also been photographed wearing an Omega Speedmaster Professional.
* Other brands: He has been seen wearing watches from brands like Tag Heuer and Breitling.
However, it's important to note that Colbert's watch choices are often influenced by the character he's playing or the specific event he's attending.
Therefore, it's difficult to say definitively what watch he prefers or wears most frequently.