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Speedmaster Calibre 321




Details & Specifications


Having been a part of all six lunar missions, the legendary OMEGA Speedmaster is one of the world’s most iconic timepieces. This model has reprised the famous Calibre 321, which was an important part of the Speedmaster’s original space history.

The 39.70 mm case is in stainless steel and is inspired by the same 3rd generation style worn during America’s first spacewalk in 1965. There is also a bezel ring in polished black ceramic [ZrO2] with the tachymeter scale in white enamel.

The black step dial features familiar Moonwatch hands, a vintage OMEGA logo, as well as a small seconds sub-dial, 30-minute recorder and 12-hour recorder along with a central chronograph hand. Through the sapphire-crystal caseback, you can see the Calibre 321 inside.


Type Famous manual-winding chronograph movement with column wheel mechanism, Breguet balance-spring and 18K SednaTM gold PVD coated finish. The calibre that was worn on the Moon.
Calibre Calibre 321
Power Reserve (h) 55 h
No. of Jewels 17
Case Material Stainless Steel
Case Diameter 39.7 mm
Water Resistance 50 m / 167 feet
Bezel Tachymetric scale
Crystal Scratch‑resistant sapphire crystal with anti‑reflective treatment inside
Dial Colour Black
Dial Indicators Indicators
Bracelet Material

Stainless Steel

Clasp Deployment clasp

Enquire about Omega Speedmaster Calibre 321 - 311.