« The Return of a Legend »
For many watch enthusiasts, it was something of a sensation when Omega announced in early 2019 that it would bring its legendary Caliber 321 back to life. In this article, we have gathered the key facts about this exceptional movement and take a look at the history of this remarkable piece of watchmaking.
The Original Moonwatch Caliber Returns
Omega's press release of January 8, 2019, set the hearts of mechanical watch lovers and technology nostalgics around the globe racing. After all, the renowned Swiss watch manufacture announced nothing less than the revival of a legend: more than 50 years after the last example was produced, the brand said, it would resume production of the chronograph Caliber 321.
Developed and launched in the 1940s, it remains one of the most coveted movements among collectors worldwide. Its enormous and enduring popularity over the decades is owed, on the one hand, to its robustness and reliability and, on the other, to its elegance and its delicate, particularly appealing design. It achieved worldwide fame through its use in the Omega Speedmaster, which would ultimately become the Moonwatch.
From Seamaster to Speedmaster: The "Career" of Caliber 321
The Omega Caliber 321 is a hand-wound chronograph movement that was first fitted to models in the Seamaster collection. That collection had already been launched in the 1940s, but at the time it did not yet include dive watches, only models with a certain degree of water resistance. When the Speedmaster collection made its debut in 1957, the by-then thoroughly tried-and-tested caliber found its way into it as well.
Its signature technical feature was the one-piece monobloc column wheel. Building a column-wheel movement demands exceptional precision in both design and manufacturing, which is why these movements are held in particularly high regard by collectors of mechanical watches. Its combination of high accuracy with robustness and reliability made Caliber 321 virtually predestined for a field that was only just emerging in the 1950s but would come to define the 1960s: human spaceflight.
NASA's "Seal of Approval"
When the American space agency NASA was looking for a suitable watch for its upcoming crewed space missions, its choice fell in 1962, after critical evaluation and extensive, demanding series of tests, on Omega's Speedmaster. The hand-wound chronograph thus prevailed over all its competitors and became the faithful companion of every American astronaut in space. The first model tested and certified by NASA was the one with reference number ST 105.003. This version was on Ed White's wrist when he made the first "spacewalk" by an American astronaut.
The successful Speedmaster caliber was also used in models with reference number ST 105.012, thereby becoming the heart of the "Moonwatch" – the very wristwatch worn by Neil Armstrong and Buzz Aldrin in July 1969 as they became the first humans to set foot on the Moon. Alongside the Omega Caliber 321 and its proven qualities, it is above all its role in the Moon landing that made this particular chronograph one of the great watch icons of the 20th century, and it remains one of the most popular classic chronographs in the luxury segment to this day.
Remarkably, in a new NASA selection process conducted in the late 1970s, Omega's Speedmaster once again left the competition behind, impressively confirming its status as the official watch for America's crewed space missions.
By that time, however, the chronographs were no longer powered by Caliber 321, but by a successor that was less expensive to produce and achieved even greater precision.
A Second Life for the Omega Caliber 321 – A Challenge for Watchmakers and Engineers
Although the Speedmaster's exterior has been modernized only very cautiously in the roughly 50 years since the first crewed Moon landing, its technical inner workings have changed noticeably. One reason is that buyers of high-end watches today often prefer self-winding models, while a hand-wound chronograph tends to appeal to dedicated retro fans. At the time of the Apollo 11 Moon mission, automatic winding technology had already been available for quite some time, but initially only for conventional three-hand watches, not for chronographs. The first mechanical chronographs with automatic movements could only be presented to the public in early 1969, after several years of research and development – just a few months before the mission began.
In the years that followed, more and more chronographs, including Omega's Moonwatch, were equipped with automatic winding mechanisms, and manual winding continued to lose importance overall. When the decision was made to relaunch the famous hand-wound Speedmaster caliber, it posed a considerable challenge for Omega's watchmakers and engineers. A dedicated team of experts worked in strict secrecy for two years on the reconstruction of Caliber 321. Research and development staff collaborated closely with historians and highly experienced watchmakers. Along the way, extensive historical material, including the original blueprints, was gathered and analyzed.
At the same time, an original Speedmaster ST 105.003 – worn in 1972 during the Apollo 17 mission by astronaut Eugene "Gene" Cernan, the last person to date to walk on the Moon – was examined using a digital scanning process. This made it possible to develop detailed design specifications and successfully implement them in producing the new edition.
The Omega Caliber 321: Symbol of an Era
The result is an authentic reconstruction of a movement that can rightly be called a symbol of the "Moon era" in Omega's corporate history. In this context, Omega President and CEO Raynald Aeschlimann expressed his amazement at how many fans Caliber 321 still had half a century after production ended, and that enthusiasts are still talking about it.
The company, he said, was delighted to now be able to fulfill their wishes with a new edition reconstructed down to the smallest detail, and had gone to great lengths to do so.
The revived Omega Caliber 321 is produced directly at the company's headquarters in Biel, where a dedicated workshop was set up specifically for this purpose. There, each individual movement is built by one assigned watchmaker.
