The Two-Tone GMT-Master II is the stainless steel and gold version of Rolex's legendary travel watch and it has continuously been evolving over the years.
Rolex GMT-Master II: A History and Comprehensive Guide
A Guide to the Rolex GMT-Master and GMT-Master II – Analog:Shift
Rolex: the history, the innovations, and the iconic models
The cosmopolitan watch
Hands-On: The Rolex GMT Master II Pepsi: Old And New Compared
The Rolex GMT-Master II Watch Guide
Rolex GMT-Master II Two-Tone 18K Yellow Gold Steel Black Dial
The Rolex GMT-Master II Watch Guide
History of the Rolex GMT-Master Collection