The "Franck Muller" Perpetual Calendar Datejust

In 1989, just before venturing out on his own, Muller wanted to create something of a special tribute to a dear friend. He began with a 16238, yellow gold Datejust, with a standard 3135 movement – a prized item on it’s own. Then Muller modified it adding a few extra features: A Months and Leap Year calendar at 12 o’clock. A Date register at 3 o’clock. A Moon Phase indicator at 6 o’clock. A Days of the Week register at 9 o’clock. By the end of the process Muller created the very first and only Rolex Quantième Perpétuel or in English Rolex Perpetual Calendar. All in a day’s work for the man known as the “Master of Complications”.