Launched As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand later partnered with Paul Mercier in 1918, starting to be the Baume & Mercier we know right now. In the course of a very hard period of time for your manufacturer, Baume & Mercier https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/