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 to be the Baume & Mercier We all know now. During a very difficult period with the model, Baume & Mercier joined the Richemont team https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/