I received an email from the Horological Society of New York about an upcoming lecture that may interest several on this forum: OMEGA Speedmaster: The Evolution of Calibers 321 and 861 Bernhard W. Stoeber, CW21 Monday, January 6, 2020, 7:00pm - 9:00pm General Society Library, 20 W 44th St, NYC 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, will discuss the evolution of Caliber 321. Stoeber's lecture will cover the history of watchmaking in the Vallee de 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. Here's the link.
The video is here: https://hs-ny.org/meetings/2020/1/6...libers-321-and-861-by-bernhard-w-stoeber-cw21 and after two months the general public can watch it too.
It was a good lecture and I enjoyed it. However, it wasn’t really appropriately titled. Most of the time was spent talking about the history of chronographs in general and the role of Lemania in the development of omega movements. Very little about the actual workings and evolution of the 321 and 861. Still, a very enjoyable lecture though!