Launched As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand later partnered with Paul Mercier in 1918, getting to be the Baume & Mercier we know today. During a very complicated interval with the model, Baume & Mercier joined the Richemont group in 1988. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/