Rolex Sky-Dweller
A watch for travellers, with an annual calendar and a second time zone on a rotating disc.
The Sky-Dweller was Rolex's most complicated watch when it appeared. The bezel is turned to select which function the crown sets, a system Rolex calls Ring Command.
Materials: Gold or steel; self-winding movement
Manufacture: Made in Geneva; the bezel is used to select the functions.
The rotating 24-hour disc in the middle of the dial.
Twelve small windows round the edge showing the month.