Marine Tourbillon Equation Marchante 5887

The Breguet Marine Tourbillon Equation Marchante 5887 is one of the rarest and most fascinating watchmaking complications. It displays the difference between the mean solar time – civil hours and minutes – and the true solar time – solar hours and minutes. The equation cam is visible on the tourbillon axis. On the Marine 5887, the minutes of the solar time are indicated directly with the solar minute’s hand with a faceted golden sun. A perpetual calendar is naturally added to this. Its various information is displayed between 9 o’clock and 3 o’clock.

The 60-second tourbillon features a titanium carriage with a silicone Breguet balance spring. This innovative characteristic allows the balance spring to reach a frequency of 4 Hz while conserving a quite comfortable power reserve for this automatic watch. Displayed in an aperture between 7 and 9 o’clock, this features a power reserve of 80 hours. On the back, a sapphire crystal caseback allows one to admire the engraving on the movement, entirely created by hand and spread out over several bridges.