Greubel Forsey debuts a red gold version of its QP à Équation, an ultra-complicated timepiece with complete perpetual calendar, tourbillon and equation of time function. The watch, which was awarded the Grand Prix d’Horlogerie de Genève award for the best Calendar in 2017, utilizes a type of ‘mechanical computer’ to manage all the changes in the displays.
This ‘computer,’ Greubel Forsey’s seventh invention, is an entirely integrated twenty-five-part component composed of a stack of cams with movable fingers that shift the indications on the dial and caseback. The month’s cam changes the month (seen on the front of the dial) and also moves the Equation of Time disc on the back. The years’ cam controls the leap year indication (front) and also the year and seasons on the back.
In summary, the dial side, now chocolate brown-colored, displays the 24 hours of the day and night, the day of the week, the large date, the month, the hours and the minutes; the movement side shows the equation of time and the seasons and the year. Price: $695,000.