The Hora Mundi is powered by the 5717 BR self-winding mechanical movement, which is based on Calibre 777 with a silicon escapement. Four patents were filed for this movement. The first was for a timepiece comprising a mechanism with two time zones; the second covered the display of a time zone on-demand via the main set of hands; the third was for a programmable and reprogrammable mechanical memory wheel for a timepiece; and the last for a mechanism for displaying a temporal dimension by means of a dragging hand.
The case is available in either 950 platinum or 18k gold and is 44 mm in diameter by 13.55 mm thick. Case water-resistance is 30 meters. The beautiful in-house movement is visible through a sapphire caseback.
The dial is has a beautiful combination of finishes and materials that make this timepiece stand out. The dial is solid gold and features Breguet hands. The chapter ring has painted Roman numerals and a silvered and circular satin-brushed finish, a border than is hand-engraved on a rose engine, and red-gold hour markers (or platinum depending on case). In the center of the dial is a view of a globe that is stamped and hand-engraved on a rose engine to create a “wave” motif on the oceans.
The oceans are then given multiple coats of lacquer and the continents polished. On the day/night indicator, the sky is made of lapis lazuli containing numerous pyrite inclusions that look like tiny specks of gold and represent the stars. The sun and moon are made of solid gold: yellow gold for the sun, rhodium-plated yellow gold for the moon. The cover for this disc, representing a cloud and bearing the Breguet name and the watch’s serial number, is also made of silvered 18-carat gold and engraved entirely by hand.
Breguet is a leader in the advancement of chronometry. Instead of being complacent, Breguet, and the best watchmaking brands continue to build on the many years of watchmaking know-how that already exist. Whether it is silicon escapements, high-frequency movements or sophisticated instant jump time zone functions.