Founded 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 all know these days. All through a very demanding period of time for your manufacturer, Baume & Mercier https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/