The Lemania 321, originally developed in the 1940s as the CH27 C12, was inspired by the need for a robust, high-precision chronograph movement for professional use in aviation, racing, and military fields. Its design prioritized accuracy and durability, leading to its adoption by Omega for the Speedmaster line in the late 1950s. The movement became legendary when the Speedmaster, powered by the Lemania 321, was chosen by NASA for space missions, including the Apollo 11 moon landing. This blend of craftsmanship, reliability, and historical significance has made the Lemania 321 a timeless symbol of horological excellence.