Greubel Forsey’s innovation in the Différentiel d’Égalité started with constructing a remontoire, which is an additional spring along the gear train that evens out the energy that is delivered and acts as a secondary source of energy. The steady flow of energy maintains a constant balance amplitude throughout the entire power reserve and because the remontoire is combined with a differential, it eliminates the disturbance to the balance wheel during the rewinding every second. Limited to 33 pieces. Brand: Greubel Forsey Model: Différentiel d'Égalité Reference Number: Différentiel d’Égalité Movement: Manual Winding Case Material: White Gold Case Size: 44mm Dial: Silver Bracelet/Strap: Leather Gender: Men's Watch/Unisex Warranty: Manufacturer's Warranty Features: Power Reserve Small Seconds Shop other beautiful pieces in our Greubel Forsey collection For inquiries on the piece please contact: boutique@shsilver.com