This is not the first time that Louis Erard has opened the door to classical watchmaking and taken a look back at the 19th century. Nor is this the first time that Louis Erard has invited Massena LAB to co-produce a creation. After Le Régulateur, shortlisted for the Grand Prix d'Horlogerie de Genève, the four-handed collaboration this time focused on the monopusher chronograph. A highly technical speciality - a single pusher to start, stop and reset the chronograph - which is expressed with great simplicity by Louis Erard: a single 30-minute totalizer on a separate dial at 12 o'clock. As its name suggests, this is a laboratory, with a laboratory technician, William Massena. Like all the other collaborations, Le Chronographe Monopoussoir Louis Erard x Massena LAB is therefore produced in a limited series: 178 pieces - a figure that symbolises "together we are stronger". 178 pieces in two variations: rhodium-plated or gilded dial.