43 mm diameter case provides 18K red gold, stainless steel and red gold with stainless steel and other metal material selection. Through the screw-in sapphire crystal back, the perfect operation of Omega coaxial movement clearly visible. Watch with a metal case with the same bracelet, or black, brown, blue leather strap. Aqua Terra GMT watch with Aqua Terra watch iconic "teak concept" dial, the vertical texture is reminiscent of luxury yacht teak deck. The matte and polished polished 18K gold hour scale coated with white luminous coating. The arched pointer is crafted from 18K white gold or red gold, also covered with a white luminous coating that can be easily read in any lighting condition. The red arrows at the end of the GMT hands make it easy to identify the two places. At the heart of the Seamaster Aqua Terra GMT watch is the Omega 8605/8615 coaxial movement. In 2007, Omega around 250 years of the first practical new escapement - coaxial escapement - designed to produce the brand self-production coaxial movement, this new movement is the Omega coaxial movement A new member of the family. The coaxial escapement in the movement is used in conjunction with a cardless balance wheel balance, which is quite different in function from a conventional lever-type escapement with a speed clip. The frequency of the watch can be adjusted by changing the moment of inertia of the balance wheel. This adjustment can be made with two fine 18K gold screws on the balance wheel. This design avoids the interference between the balance spring and the quick-and-easy grip, thus ensuring that the coaxial escapement brings long-term stability to the watch. The reduced friction means basically no need for lubricant, so the coaxial movement has a longer maintenance cycle. Omega Seamaster Aqua Terra GMT watch is also equipped with a silicon hairspring, enjoy up to 4 years of service guarantee. Omega 8605/8615 coaxial movement is the first self-produced coaxial Omega movement family equipped with GMT complex functions of the movement. GMT pointer with a bright red polished arrow, you can easily read another time zone time or Greenwich Mean Time. Interestingly, the GMT pointer can also be used as compass orientation: In the northern hemisphere, the watch is placed horizontally, hour and 24-hour GMT pointer are transferred to the local time, the hour hand points to the sun, the direction of the GMT pointer is the north .