...In 1993, Patrick Heiniger decided to give the highest ranking Rolex directors a Daytona combining the most precious metal and an exclusive blue dial.
http://stefanomazzariol.blogspot.com/2011/02/rolex-daytona-16528-blu-dial-rolex.html
http://stefanomazzariol.blogspot.com/2011/02/rolex-daytona-16528-blu-dial-rolex.html