task / idea
a watch with a 12-hour dial capable of indicating the time in a second time zone at the same time.
solution / implementation
the solution would have to be based on a movement providing a standard date function, such as the eta 2892 or eta 2824-2. the date disk would be replaced by an hour disk bearing 48 instead of the 31 teeth on the inside. the disk would be printed with the hours 1 to 12 arranged equally around it instead of the dates 1 to 31. in place of a date window, the dial would feature 12 hour-windows through which the digits of the hour disk can be seen. with the crown in the first position, the second zone’s hour disk can be moved in quarter-hour steps using the movement’s existing date adjustment mechanism.