Launched As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the manufacturer later on partnered with Paul Mercier in 1918, getting the Baume & Mercier We all know currently. During a very difficult interval for that model, Baume & Mercier joined the Richemont team in 1988. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/