The Serial Number on my Centurion is: KE511446. I haven't gone through the entire 72 pages on this thread, but have not seen any SN's with this format. I am guessing that this is a 1985 unit.

My bike is a Dave Scott Ironman with Shimano 600 components; I believe it is a 60 cm frame (measured from center of BB to center of top frame (23-3/4")). Color: metal flake grey on grey.