Mine's a two tone blue, the main color is "ice blue" which is what I'd call a light-medium blue, and the headtube and some highlighting around a couple of the lugs is darker blue. With the serial number info, my frame was built in June '83, which makes it an '83 model. Here's a link to the '84 catalog on Sheldon's site: http://sheldonbrown.com/centurion198...0pro-tour.html

And here's a link showing detailed specs for all the '84 Centurions: http://sheldonbrown.com/centurion198...s/20specs.html