Established As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand later partnered with Paul Mercier in 1918, turning out to be the Baume & Mercier We all know now. Throughout a particularly demanding period with the brand, Baume & Mercier joined the Richemont group https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/