A MODERN CLASSIC: THE ONLY EXTERNAL GMT BEZEL ILLUMINATED BY MICRO GAS TUBES. Still ahead of its time, the Engineer Hydrocarbon AeroGMT II is a jet-setting modern classic. Whether cutting through dark skies or planning a long voyage, instant visibility in darkness is taken to new heights. The groundbreaking rotating bezel is illuminated by micro gas tubes for unmatched brightness in all dark conditions. This revolutionary timepiece is specially crafted for commercial pilots and is a trusted tool while navigating through the darkest nights. It is a timepiece without equal.