This year, Breguet’s Marine collection gains an unprecedented timezone model in a steel or rose gold case. 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.

Case	:	in 18-carat rose gold with fine fluting on the caseband
Caseback	:	Sapphire-crystal
Diameter	:	42 mm
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
Hands	:	Open-tipped Breguet in polished steel
Movement	:	selfwinding, numbered and signed Breguet
Calibre	:	517F. 11½ lignes. 28 jewels
Power reserve	:	72 hours
Escapement	:	inverted in-line lever and flat balance-spring in silicon
Balance frequency	:	4 Hz Adjusted in 6 positions
Strap	:	black rubber
Also available	:	in a steel case with silvered dial Reference 5857ST/12/5ZU