If you want one watch to handle a long-haul trip, a swim on arrival and a meeting the next morning, the black Longines HydroConquest GMT L3.790.4.56.6 is about as no-nonsense as it gets. It pairs a sunray black dial with a ceramic bezel and a steel bracelet, so the dual-time function looks right at home.

Longines expanded the HydroConquest line with GMT models, drawing on the brand’s long experience with watches that show more than one time zone. The engine is the exclusive L844 automatic. Its independent 24-hour hand gives you a second zone at a glance, its silicon balance spring shrugs off magnetism, and it runs for about 72 hours on a full wind. Because this is a true dive watch as well as a traveler, it is rated to 300 meters with a screw-down crown and caseback.

Black is the most versatile choice in the range. The sunray finish keeps the dial from looking flat, shifting from deep charcoal to glossy black as you turn your wrist. The 41mm case is 12.9mm thick.

Technical sheet: HydroConquest GMT black, ref. L3.790.4.56.6

• Case: 41mm stainless steel, 12.9mm thick, 21mm between the lugs
• Dial: sunray black, luminous indexes and hands, date display
• Bezel: unidirectional rotating with ceramic insert
• Movement: exclusive Longines L844 GMT automatic, silicon hairspring
• Power reserve: around 72 hours
• Magnetic resistance: about ten times the ISO 764 standard
• Water resistance: 30 bar (300m)
• Bracelet: stainless steel with folding clasp

Understated, tough and ready for any time zone. This is the safe pick in the best sense.