Press release
The timezone of this Marine GMT watch, a function that frequent travellers find most useful, is shown by the two central hands. A chapter ring of hours, off-centre at 6 o'clock, shows the reference time. An aperture for the dates in the reference timezone makes the watch even more practical.
The distinguishing features of the Marine GMT 5857 include the tough and action-ready character emanating from its 42 mm diameter case, its welded lugs, rubber strap and guards protecting the crown. In contrast, the dial is engine-turned in a wave pattern on silvered gold for the steel version and on blackened rhodium for the model in rose gold, the sophistication of which is underlined by finely interlaced circles. The hours chapters are also differentiated by Roman numerals for the reference time and Arabic numerals for the timezone.
The sapphire crystal caseback reveals the selfwinding calibre 517F movement of 11½ lignes with a power reserve of 72 hours. The use of silicon for the inverted in-line lever escapement and the flat balance-spring ensures a stable rate from a balance vibrating 28,800 times an hour.
SPECIFICATIONS OF THE WATCH
REF. 5857BR/Z2/5ZU
Case in 18-carat rose gold with fine fluting on the caseband. Sapphire-crystal caseback. 42 mm diameter. Welded lugs with screw bars. Water resistant to 10 bar (100 m).
Dial 18-carat gold coated in blackened rhodium and engine-turned by hand in a wave pattern. Timezone in the centre, reference time at 6 o'clock, 24-hour dial at 2 o'clock. Individually numbered and signed BREGUET. Hours chapter with Roman numerals for the reference time and with Arabic numerals for the second timezone. Open-tipped BREGUET hands in polished steel.
Movement selfwinding, numbered and signed BREGUET. Cal. 517F. 11½ lignes. 28 jewels. 72 hours of power reserve. Inverted in-line lever escapement and flat balance-spring in silicon. 4 Hz balance frequency. Adjusted in 6 positions.
Black rubber strap.
Also available in a steel case with silvered dial: reference 5857ST/12/5ZU
