With the Greubel Forsey GMT you have the whole World in your hand , well at least on your wrist. The lightweight titanium globe allows you to visualise not only the time but also the position of day and night across different continents via the 24-hour ring around the equator while the caseband window symbolises the position of the sun on the earth. The globe completes one full counterclockwise rotation every 24 hours, matching the rotation of the Earth, and is surrounded by hour indicators split into white and black numbers indicating the daytime and night-time hemispheres. A worldtime disc on the rear of the watch is connected to the globe and bears the names of 24 cities, each representing one of 24 global time zones. There’s no pricing on the site but with construction materials like 18 karat gold, alligator leather and sapphire crystals it’s probably not going to be cheap.