It took me a while to figure this one out (what the heck is that?). White rolled gold plate with a two tone silver dial with alternating white gold numbers and squares. Period Hadley band added by me. Watch was received caked with grime and mounted on a worn out nylon striped band. A first for the database as seen in the 1958-1959 Linebook136, Keeping excellent time.
1957 Ambassador "O"