Breguet

This lovely and complicated Breguet is not only equipped with a perpetual calendar and power reserve, but also contains a complication known as an equation of time. This complication shows the difference between "true" solar time and "mean" solar time. The "mean" solar time refers to common time, based on a conventional twenty-four hour period, while "true" solar time varies with the earth's irregular orbit around the sun. The two times are only equal on four days a year. This complication is very rarely seen and its display is incorporated beautifully on the dial layout of the present watch.