
321.Īlbert Piguet designed what would enter the annals of horological history as the caliber 321 in 1946. The association with Lemania and Omega was a long-lived one, spanning nearly four decades, and is marked by the masterful hand of Albert Piguet, Lemania's head movement designer, who conceived such venerable calibers as the caliber. In the 1930s, the quality of Omega's chronograph movements was improved by the acquisition of famed manufacturer of chronograph ébauches, Lemania. Omega produced their first chronographs as pocket watches as early as 1885, and by 1913 were putting them on straps. Once more Omega subjected these watches to pressure tests at 60 meters and temperatures ranging from -40 to 122 degrees Fahrenheit. Before then, only submarines or aircrafts used O-ring gaskets, but Omega applied that technology to seal the cases of their Seamaster line, replacing the lead gaskets used by Omega and many other brands. KO 2657 saw another innovation, unprecedented in horology, that guaranteed improved water-resistance: the rubber O-ring gasket. In fact, they were perhaps even more robust than their military predecessors, thanks to their reinforced crystals and the fact that they were equipped with Omega's very first automatic movements, the caliber 28.10 and caliber 30.10. CK 2518) lost nothing in terms of water-resistance or robustness. Of all the twenty thousand watches the RAF received from Omega, each one met those rigorous standards in turn, after the war, Omega was inspired to release a line intended for civilian use. To ensure water-resistance, each watch was submerged for a period of 72 hours at varying temperatures and pressures. Much like the "Dirty Dozen" and IWC/JLC Mark XIs issued to the British armed forces, the watches Omega supplied to the RAF had to be water-resistant, contain interchangeable parts, and be extremely durable. These watches, of course, had to meet rigorous standards that the British Ministry of Defense required of all wristwatches they received for use by the troops. The Seamaster line debuted in 1948, and has its roots in watches Omega supplied to the RAF during the Second World War. Its reputation is such that Omega's chronograph offerings in its other lines are often overlooked-undeservedly, because while these other chronographs might not have the reputation of the Speedmaster, they are just as thoughtfully-crafted and deserving of attention as their more famous cousin. The history, the lore, the fact that it went to the moon.

Aficionados of vintage Omega chronographs already know the Omega Speedmaster.
