World Timer GMT

This item starts with a wall clock with a diameter of 70 cm

On the "Rex Mundi" dial, you can see that the central part has a map of the globe, seen from the North Pole. A black hand crossing Mexico City and a red hand stuck on the outside of the disc, aligned with the Greenwich meridian. The disc makes one counterclockwise rotation in 24 hours.

The clock has an Ergas de Tramelan movement, winding the barrel spring by a small 6-volt electric motor.
Manufacturing period: 1968 for the Olympic Games in Mexico City, there are three bezel colours, gold, silver and bronze like the medals.

Brevet Ergas Tramelan, Erwin Vuilleumier 301.87 KB

Concerning watches, here is to start with the 1971 Edox Geoscope

Large watch with a diameter of 42 mm, monocoque type case, a crown located at 8 o'clock allows the inner flange to be rotated by 24 hours to match the central card, which makes one revolution in 24 hours.

This map of the globe, seen from the South Pole, features red dots to locate 24 cities around the world.

For more explanations, see the period documents.