Started As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand later on partnered with Paul Mercier in 1918, turning out to be the Baume & Mercier we know now. All through a particularly tough period of time to the manufacturer, Baume & Mercier joined https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/