The Jaeger-LeCoultre Master Compressor Diving GMT Navy Seals in Black Titanium. Model Reference: Q178T471. Limited edition of 500 pieces. With its super-rugged grade 5 titanium case, unidirectional bezel and ability to remain watertight to 1000 metres, Jaeger-LeCoultre’s Master Compressor Diving line meets the most stringent requirements for a diving watch. So it is natural that professional divers – those for whom each dive involves performing challenging feats and surpassing limits – choose these timepieces. Jaeger-LeCoultre is constantly conferring with experts, such as snorkelling record holder Patrick Musimu, about the relevance of its latest innovations. Through a partnership with the United States Navy SEALs, the Navy’s elite unit of combat swimmers, the Master Compressor Diving line included this limited series having a shot-peened ceramic bezel and engraved with the Navy SEALs emblem. The eagle brandishing a trident in its talons is a symbol of excellence for these extraordinary timepieces. Like their namesakes, some of the best soldiers in the world, the high-tech Navy SEALs pieces combine uncommon performance and endurance. All SEAL equipment is subjected to very strict quality testing. Designed with the same goal of outstanding performance and exceptional sturdiness in mind, the ultrasophisticated Master Compressor Diving Navy SEALs line is made to be water-tight at record depths and incorporates new technical advances that make the watches both safer and even more of a pleasure to use – even in the most extreme environments. Since 2007, Jaeger-LeCoultre’s Master Compressor Diving collection has been the nec plus ultra of diving watches. This collection, a technical answer to the stringent NIHS 92-11 criteria (ISO 6425) established by the Swiss watchmaking industry, does not simply meet the requirements of shock resistance, watertightness to 100 metres minimum, and safety thanks to a unidirectional rotating bezel; it elevates its exceptional performance to the level of a new standard. The Master Compressor Diving models exceed the required standards in all respects. The high-tech, super-rugged sapphire-blasted unidirectional ceramic bezel is protected against misuse to guarantee perfect safety; stamped oversized hour-markers and numbers and the use of superluminova provide excellent legibility even in the darkest places; and the shape of the case, which is designed to resist the high pressure at great depths, ensures perfect watertightness to depths of 1000 metres. This watch is a member of the very select circle of timepieces that combine the chronograph function with a second time zone. The new self-winding mechanical movement, Jaeger-LeCoultre’s Calibre 757, operates at a frequency of 28,800 vibrations per hour and has a 65-hour power reserve. The black and white dial is perfectly legible despite the amount of information it provides: hours and minutes in the centre, chronograph function display on the centre second hand, hour counter at 9 o’clock and minute counter at 3 o’clock. The operating indicator takes the form of a disc alternating white and black with white streaks as it rotates. Inspired by the hometime/traveltime principle patented by Jaeger-LeCoultre, the second time zone indicated by a skeletonised hand is supplemented by a day/night indicator appearing in an aperture at 12 o’clock. The crown at 3 o’clock is flanked by two pushpieces that are covered with black rubber and sport the line’s iconic compression fins – the pushpieces that operate the chronograph. This highly technical instrument is 46.3 mm in diameter. The watch comes in original packaging, with a set of documents.