QP à ÉquationReference# QP a Equation
- Case: 18-karat rose gold
- Size: 43.5mm
- Movement: hand-wound manufacture caliber
- Function: inclined 24-second tourbillon, bi-directional perpetual calendar, power reserve, equation of time with month, season, solstic and equinox indicators
- Power Reserve: approximately 72 hours
- Water Resistance: 30m
- Dial: chocolate brown
- Caseback: sapphire crystal
- Hands: hand-polished rose gold with luminous tips
- Strap/Bracelet: hand-stitched alligator leather
- Factory Warranty: three years
Following the GPHG (Grand Prix d’Horlogerie de Genève) award for the best Calendar Prize, Greubel Forsey presents its QP à Équation in a rose gold case with a chocolate-colored gold dial. By reinventing the prestigious perpetual Calendar (QP), with the QP à Équation, Greubel Forsey demonstrates through their art of invention that the history of mechanical watchmaking remains in a perpetual state of evolution.
This reinvention of the perpetual calendar integrates the Equation of Time into the perpetual calendar, as well as bringing practical new functions and indications that improve clarity. The priority was to simplify a complete perpetual calendar display and yet make it much easier to set by simply using the bidirectional crown. Despite the numerous indications and functions, Greubel Forsey’s Mechanical Computer is as easy to set as a simple date feature.
To meet this technical challenge Greubel Forsey invented a sophisticated coding mechanism: the patented Mechanical Computer. A stack of cams with movable fingers shift the indications on the dial and caseback of the timepiece and the complete mechanism is fully integrated within the movement. The month’s cam changes the month, displayed in a window on the front and also moves the Equation of Time disc on the back. The years’ cam controls the leap year indication on the front and also the millesime and seasons on the back. The development of this coding device not only overturns the conventional way of setting the indications but also displays them simultaneously on both dial and caseback.
Just a glance at the calendar display clearly reveals the three in-line windows that clearly indicate the day, the date and the month. The large date makes the calendar extremely legible.
The dial side of the QP à Équation indicates leap years, the 24 hours of the day and night, the day of the week, the large date, the month, the hours, the minutes and the seconds, as well as the 72-hour chronometric power reserve.
On the movement side, this timepiece displays the Equation of Time with the months, seasons, solstices and equinoxes, as well as the calendar year.