The QP à Équation brings a totally new interpretation to some of the calendar functions incorporated in age-old astronomical clocks. It is composed of a set of coding wheels superimposed in a coaxial manner. The dial features leap years, 24 hours of the day and night, day of the week, date, month, and a 72-hour power reserve indicator. The bridge side features equation of time with month, season, solstice and equinox indicators. Available in 18 karat white or red gold. Brand: Greubel Forsey Model: QP à Équation Reference Number: QP à Équation Movement: Manual Winding Case Material: White or Red Gold Case Size: 43.5mm Dial: Rhodium Gold Bracelet/Strap: Leather Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Tourbillon Power Reserve Small Seconds Day, Date, and Month Leap Year Day/Night Seasons Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com