The Jaeger-LeCoultre Master Geographic offers a second-time zone that can be read and adjusted much more easily than on GMT watches. A second sub-dial shows hours and minutes in another time zone, and an additional small 24-hour display for the second time zone also makes it easy to know whether it’s day or nighttime in the other time zone. In the aperture at the bottom of the dial, cities in the world’s 24 time zones are visible. This can be adjusted to the time zone of your choice and the hour hand of the second time zone will be adjusted accordingly. The Master Geographic also has a sub-dial for the date and the remaining power reserve.