The Longines Spirit Zulu Time Titanium is a 39 mm-diameter, topped by a bidirectional bezel with a bi-finish ceramic insert in matt black and intense polished black, water-resistant to 10 bar (100 meters) and powered by the exclusive Longines GMT caliber with apower reserve of up to 72 hours. It is officially certified as a chronometer by the COSC. This pilot's watch comes on a Grade 5titanium bracelet with double-security folding clasp.