Limited Edition of 178 Pieces. Louis Erard Watch Le Regulateur Louis Erard x Atelier OI Limited Edition 85237AA53.BVA33. Louis Erard marks a new stage in the accessible creation watch, with a fresh look at all the crafts that make up watchmaking. For this new collaboration, Louis Erard turns to architecture and design with atelier oi, a regional company that has been shining internationally for 30 years, and a radiant watch, too. Louis Erard invited atelier oi to look into the question and the answer is a new original dial, the third part of the series of collaborations already co-signed by Alain Silberstein and Vianney Halter. Once more based on the emblematic model of the Maison: the regulator. Once again with the desire to bring together key players in traditional watchmaking culture. And again with the desire to bring together key players in Swiss know-how: atelier oi and Louis Erard are both regional companies of international stature.