Started As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the manufacturer afterwards partnered with Paul Mercier in 1918, starting to be the Baume & Mercier we know today. Through a very hard time period with the brand name, Baume & Mercier joined the Richemont group https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/