Started As Frères Baume in 1830 in Geneva, by brothers Louis-Victor and Célestin Baume, the brand name later on partnered with Paul Mercier in 1918, getting the Baume & Mercier we know right now. For the duration of a very challenging period of time with the model, Baume & Mercier https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/