Rolex Sky-Dweller: 42 mm, Yellow gold, bright black dial, Oyster bracelet, m336938-0002

The selected reference time, which can be the traveler’s regular work place or their home, is shown by a fixed, inverted red triangle on the dial, which is located on the off-center 24-hour disc. This 24-hour display makes it easy to tell when it is daytime in the other time zone and when it is nighttime.

One notable feature of the Saros annual calendar is the deep red rectangle that shows the current month in one of the twelve windows surrounding the dial. The clever mechanism of the watch makes life easier for the wearer by eliminating the need to think about changing the date at the conclusion of a 30-day month. The accurate dates are shown throughout the year on the annual calendar. There is only one modification required, which is on March 1 (February has only 28 or 29 days).