Omega Seamaster Aqua Terra Master Chronometer GMT Worldtimer
One of the most complicated watches on the permanent collection for Omega, includes the “Aqua Terra Master Chronometer GMT Worldtimer”. This model debuted back in 2017 and since then it has had some updates, but its core characteristic traits have endured. Now it returns yet again with three new options that mix alloys in subtle ways that manage to remind horology aficionados of its aesthetically pleasing layout for world travel. The 43 mm case is available in stainless-steel or grade 2 titanium, both with an overall brushed finish and some polished bevels. Further measurements are lug-to-lug 50mm and a height of 14.1mm. Mounted to the case is a ceramic bezel in green (steel version) or black (titanium version).
On the flip-side is a sapphire crystal exhibition caseback that allows a view into the movement. It features an oscillating weight decorated with Geneva stripes in arabesque and blackened screws. 
It also comes equipped with a screw-in crown and short wide lugs that provide a very comfortable wrist fit. All topped by a domed scratch-resistant sapphire crystal with an anti-reflective treatment on both sides. Water-resistance can reach up to 150 meters (500 feet).
Time is exhibited on a “grand feu” dial in sun-brushed green for the steel version with applied hour index markers and a pair of 18k Moonshine gold central hands to point out current time. There is also a date aperture that blends well with the rest of the dial, while using white numerals for visibility at the 6 o’clock position.
While the black and gray dial for the titanium version had all its colors crafted with lasers. There are no transferred elements, except for the word “London” in hand-applied red varnish. This dial has a matte finish and keeps its color palette dark with blackened hour indices and central hands
As a world-timer watch it’s been equipped with a fixed cities disc and a 24-hour home-time wheel. Unlike the previous model these didn’t use a color code to distinguish between which cities are enjoying summer-time (+1h in summer). In common all versions include “London” printed out in red font, which is the GMT reference.
Typically world-timer watches use the cities of Paris or Geneva to represent the time-zone of GMT +1, but this model has replaced those cities with Bienne, which is the Swiss city where Omega is headquartered.
Omega Seamaster Aqua Terra Master Chronometer GMT Worldtimer
This “Omega Seamaster Aqua Terra Master Chronometer GMT Worldtimer” (References below) is powered by the caliber 8939 with 39 jewels and 25,200 vph. It comes equipped with a free sprung-balance and a silicon balance spring that have a rhodium plated finish adorned with Geneva waves in arabesque. Master chronometer certified by Omega and also METAS certified by the Swiss Federal Meteorological and Measures Institute. Power reserve can last up to 60 hours, when fully wound.
Mounted to the watch is either an integrated 3-link bracelet (in stainless-steel or titanium), secured to the wrist by a folding clasp; or a green rubber strap with exposed white stitching, secured by a stainless-steel folding clasp.
For more up to date information visit the official Omega website here.
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