In 1996, Andersen Genève presented the first perpetual secular calendar in wristwatch form that was “programmed” for a cycle of 400 years. Devised to accommodate the whims of the Gregorian calendar, this rare and challenging complication automatically adjusts its display to months with 30 or 31 days, and to the 28 or 29 days of February, and takes into account century years which, because they are not divisible by 400, are not leap years, namely 2100, 2200 and 2300. A single correction and February will have just 28 days (instead of the 29 shown by every other perpetual calendar). In celebration of the 20th anniversary of its perpetual secular calendar, Andersen Genève has added a new complication: a day of the week indication. Given that their names are derived from the names of the sun, the moon and five planets, these seven bodies are shown as hand-engraved gold buttons on the dial. The current day of the week is shown by a dot in a small aperture above each one. Proposed as a 20-piece limited series, in platinum only.