Breguet Marine Hora Mundi 5555 Highlights Mechanical Art

Breguet unveils the 5th chapter in its 250th anniversary celebrations, a brand-new version limited to 50 pieces called Marine Hora Mundi 5555.

As part of its 250th anniversary celebrations, Breguet introduces the fifth chapter in this landmark series: the Marine Hora Mundi 5555, an exceptional timepiece limited to just 50 numbered pieces worldwide.

This rare creation exemplifies Breguet’s enduring mastery of horological artistry. The dial is a technical and aesthetic marvel, composed of two superimposed layers—an intricate guilloché base and a translucent sapphire disc above. Drawing inspiration from NASA’s ‘Black Marble’ (below), a satellite-captured nocturnal image of Earth, the dial reveals a captivating vision of our planet illuminated by city lights.

This choice of a night-time Earth view is more than poetic—it underscores the global traveler’s constant motion across time zones. The Hora Mundi complication, celebrated for its intuitive instant-jump time display, becomes a symbolic companion for the perpetual voyager, embodying both innovation and the luminous heartbeat of a world that never sleeps.

Gregory Kissling, CEO of Breguet presenting the Marine Hora Mundi 5555 in London

A true collector’s piece, the Marine Hora Mundi 5555 is a testament to Breguet’s rich legacy and forward-looking spirit—crafted for those who value not just timekeeping, but timelessness.

The new Marine Hora Mundi 5555 is based on the timepiece in the current collection: 43.9 mm case, 77F1 calibre with pre-programmable instant jump dual time zone, date, day/night indicator and synchronised city. But that’s where the comparison ends. Beyond that, everything about the Hora Mundi 5555 is new, starting with its dial.

Offered for the first time in Breguet gold, this Hora Mundi 5555 also uses a new dial decorated with phosphorescent enamel, the subject of a patent application. Each of the 50 collectors will be able to personalise the cities assigned to the 24 time zones.

The heart of the Hora Mundi 5555 remains the 77F1 calibre. This robust movement has powered the Hora Mundi collection since its creation. In addition to the time and date, it indicates a second time and date pair for the time zone of one’s choice, based on one of the 24 cities each representing a time zone.

Unique to Breguet and without equivalent on the market, it is based on the principle of a mechanical memory with instantaneous display. After setting the time and date with the crown at 3 o’clock in relation to a first city, simply set the second city and its time zone with the push-button crown at 8 o’clock.

The mechanism then calculates the time and date by means of a system of cams, hammers and an integrated differential. By simply pressing the pusher at 8 o’clock, the display switches on demand between the first and second time zones, automatically adjusting the date in both cases. An indicator at 4 o’clock specifies whether the time zone displayed is in the day or night zone. The calibre 77F1 is protected by several patents. One relates to a timepiece comprising a dual time-zone mechanism; the second to the display of a time zone on demand via the main pointer; the third to the programmable and reprogrammable mechanical memory wheel for a timepiece; and the last to the device for displaying a time dimension via a trailing hand.