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