The Breguet Marine Hora Mundi 5555 is a limited creation of just fifty timepieces, conceived to honour the Maison’s 250th anniversary. Its dial is a spectacle of artistry, built on two levels with a guilloché metal base beneath a transparent sapphire plate. Inspired by NASA’s “Black Marble” imagery, it evokes the Earth illuminated at night, where glowing cities sparkle against deep oceans. A patented phosphorescent enamel, applied for the first time on gold, lends a subtle luminescence once darkness falls, further enhancing its poetic representation of the world in motion.

Inside beats the self-winding calibre 77F1, a movement of 384 components that delivers a dual-time display with memory, central seconds, and date indication, designed to serve the modern traveller. Housed in a 43.9 mm case of 18K Breguet gold with a sapphire back and water resistance to 10 bar, the watch embodies both strength and refinement, secured by a hand-stitched alligator strap with a matching deployant clasp. The Marine Hora Mundi 5555 is at once a technical triumph and a work of art, a luminous companion for those who journey across the world’s time zones.

Technical Details

Material – 18K Breguet gold

Shape – Round

Width – 43.9 mm

Thickness – 13.8 mm

Caseback – Sapphire crystal case back

Width of lugs – 23 mm

Type of crown – Screw-down crown

Water resistance – 10 bar (100 metres)

Dial finish – Two-level dial with hand-guilloché metal base and transparent sapphire plate

Dial coating – Grand Feu blue enamel with patented phosphorescent enamel

Hand material – 18K Breguet gold

Hand type – Faceted hands with luminescent coating

Complications – Dual time with memory, date indication, central seconds

Strap – Alligator leather

Type of buckle – Triple-blade folding clasp

Material of buckle – 18K Breguet gold

Movement – Calibre 77F1, numbered and signed Breguet

Diameter of movement – 32.8 mm (14.5 lines)

Thickness of movement – 8.35 mm

Number of components – 384

Number of jewels – 40

Winding – Automatic

Oscillating weight – 18K gold rotor, hand-engraved with wave motif

Frequency – 4 Hz (28,800 vibrations per hour)

Balance spring – Silicon balance spring

Barrel – Single barrel

Power reserve – 55 hours

Bridge decoration – Rhodium-plated, hand-engraved and circular-grained with polished bevels