History of Watchmaking

Based on research by Charles-Edouard Guillaume and in collaboration with the Imphy steelworks, the compensating balance-spring was made using a nickel-steel alloy.
Cartier created the Tank.

World history

In the Hall of Mirrors at Château de Versailles, Germany and the Allies signed the treaty which ended the First World War.
In Milan, former journalist Benito Mussolini founded the "Fasci di Combattimento" fascist movement.

Swiss history

1918. General strike. The army was mobilised and the 250,000 strikers ended their movement without condition, though certain of their demands were satisfied (48-hour week, higher wages).
Geneva was chosen as the seat of the Society of Nations and of the International Labour Organisation.

Art and Culture

Walter Gropius (1883-1969) founded the Bauhaus movement in Weimar.
The Soviet painter Vladimir Tatlin began Constructivism.