What kind of watch does Clint Eastwood wear?

Clint Eastwood is one of my favorite actors.  From classic spaghetti westerns to Dirty Harry to modern classics like Gran Torino, he has been a major contributor to American cinema.  It's natural to wonder what kind of watch he wears.  In this 1981 NASA photograph, Eastwood is wearing a Rolex GMT Master.

According to the "Rolexicon" published by the renowned British watch magazine, QP, this watch has been nicknamed "The Dirty Harry" by Rolex collectors.  Due to the brown bezel scheme, this Rolex is also known as the "Root Beer" watch.

For the rest of us, it can be difficult to find a similar watch that evokes the Rolex look and feel at an affordable price point.  One watch that I found on Amazon looks like a GMT Dweller.  However, it would be tough to find one with a "root beer" bezel design.