Established As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand later partnered with Paul Mercier in 1918, becoming the Baume & Mercier We all know currently. In the course of a particularly complicated period for the model, Baume & Mercier joined the Richemont group https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/