The legendary OMEGA Speedmaster is one of the world’s most iconic timepieces, having played a role in all six lunar missions. Powering this stainless steel model is the famous Omega Calibre 321, the driving force behind the chronograph’s extraordinary space history.

OMEGA Speedmaster Moonwatch Professional Chronograph

Legend in Steel

Inspired by the same 3rd generation style that astronaut Ed White wore during America’s first spacewalk in 1965, this 39.7 mm model features a bezel ring in polished black ceramic [ZrO2], a tachymeter scale in white enamel; and a black step dial with Moonwatch hands and vintage OMEGA logo.

OMEGA CALIBRE 321 Speedmaster Moonwatch

OMEGA Calibre 321

The 321 is still highly sought‑after by collectors around the world. As a tribute to its enduring popularity, OMEGA undertook extensive research and reconstruction in a dedicated workshop. Now, more than 50 years on from its last wave of production, the Calibre 321 has been reborn, in line with its original specifications.

Omega calibre 321

The Steel 321 Up Close

Our brief history of the 321 provides a compelling back-story of the Moonwatch and its famous movement. Find out what makes this particular stainless steel version a legend in its own right.