Started As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the model later on partnered with Paul Mercier in 1918, turning into the Baume & Mercier we know nowadays. During a particularly hard interval for your manufacturer, Baume & Mercier joined the Richemont team in 1988. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/