1918
- Under the leadership of William Baume, the merger of the company „Baume Frères“ with the Geneva watch maker Paul Mercier, son of a tsarist officer, is performed. In the following years arises the world-famous watch manufacturer Baume & Mercier.
- Georges Schaeren founds the well known watch manufacturer Mido.
- Death of the Audemars Piguet co-founder Jules-Louis Audemars.
- Shokosha Watch Factory, which would become Citizen, is founded.