Started As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the model later partnered with Paul Mercier in 1918, turning into the Baume & Mercier We all know currently. Through a particularly tough period of time to the manufacturer, Baume & Mercier joined the Richemont team https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/