You likely have heard about the watch that went to the Moon, OMEGA’s Speedmaster. But what you may not know is the fascinating story of the movement inside that watch, the Caliber 321. At the January 6, 2020, meeting of the Horological Society of New York, Bernhard Stoeber, CW21, will discuss the evolution of Caliber 321. Stoeber’s lecture will cover the history of watchmaking in the Vallée Joux and that of Lemania, as well as their relationship with OMEGA. The focus will be on the early development of Caliber 321, why this caliber was selected by NASA for their manned space program and the transition to Caliber 861. The lecture will also include the changes at Lemania after 1982, how it became part of Breguet, and the more recent Special Editions released by OMEGA of the Speedmaster.