Established As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the manufacturer afterwards partnered with Paul Mercier in 1918, turning out to be the Baume & Mercier we know currently. During a particularly hard period for that model, Baume & Mercier joined the Richemont group in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/