Omega

Speedmaster Calibre 321 (Black Dial)

Name: Omega Speedmaster Calibre 321 (Black Dial)
Brand: Omega
SKU: 311.50.39.30.01.001
Availability: InStock

Ref. 311.50.39.30.01.001

On request

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Case39mm 18k white gold

DialBlack

MovementCalibre 321

ComplicationChronograph

BraceletWhite Gold

PapersPresentation Box

The Speedmaster is the Moonwatch: NASA certified in 1965 and worn on every lunar mission, the only watch qualified for spacewalks to this day. Its manual chronograph remains in continuous production as a working piece of history.

A Speedmaster Calibre 321 in 39mm 18k white gold, black on the wrist, chronograph inside. Calibre 321 keeps it running.

Fun fact: Calibre 321 is the movement that went to the Moon: a column wheel chronograph Omega stopped making in 1968 and rebuilt in 2019 by scanning Eugene Cernan's Apollo 17 Speedmaster with a tomograph to recover the geometry.

The Ed White case, calibre 321 inside

Reference311.30.40.30.01.001

Case39.7mm stainless steel

MovementManual-wound calibre 321, column wheel chronograph

Introduced2020

Why this one matters

Calibre 321 ran the Speedmaster from 1957 until 1968-69, through the 2915, 2998, 105.003, 105.012 and 145.012, which covers both the watch Ed White wore outside Gemini 4 and the one worn on the Moon. Omega replaced it with the 861 from 1968, a movement that was simpler and cheaper to build.

The calibre returned in 2019, reconstructed after Omega ran a tomographic scan of the movement inside the ST 105.003 that Gene Cernan wore on Apollo 17. A platinum model came first, and the steel version followed in 2020 in a 39.7mm case drawn from the 105.003: symmetrical, without crown guards, and hung on a flat-link bracelet in the style of the period.

The movement

The 321 is a column wheel chronograph with a lateral clutch, running at 18,000 vph, and it is the reason this reference exists. Omega rebuilt it from a tomographic scan of an original alongside archival plans and research, and assembles it in a dedicated atelier, one watchmaker to a movement. It is not a modern high-frequency design and does not pretend to be. The action is that of a column wheel chronograph of this generation.

On the wrist

At 39.7mm with straight lugs and no crown guards, the case sits much closer to a 1960s Speedmaster than to the 42mm Professional. The box sapphire adds height without adding width. On the wrist it reads as the quieter of the two, and the sapphire back leaves the calibre in view, which the hesalite version of the Moonwatch does not.

Questions we are asked about this reference

Is this the same movement as the Moon watches?

It is the same architecture, built to the original dimensions using current materials and finishing, in a dedicated atelier. It is a current production movement, not old stock.

Why 39.7mm rather than 42mm?

The case follows the 105.003 that Ed White wore, which predates the crown-guard Speedmasters. The size is part of the reference, not a shrunk Moonwatch.

Hesalite or sapphire?

Sapphire front and back on this reference, so the calibre is on view. The standard Professional is offered either with a hesalite crystal and solid caseback or with sapphire front and back.

Speedmaster

The chronograph that went to the Moon, still built to that brief

The Speedmaster started in 1957 as a motorsport chronograph, and the hand-wound Moonwatch still traces that original brief. NASA qualified it for spaceflight in 1965, and the Moonwatch has kept the same broad shape since: usually a black dial, tachymetre bezel, three sub-dials. Around it sit other chronographs, some smaller and dressier, some larger and more modern, so the family runs from strict tool watch to everyday sports piece.

tachymetre bezel

Moonwatch asymmetric case, twisted lugs

three sub-dials, most models

hesalite or sapphire, Moonwatch only

Sizes in the family

Moonwatch at 42mm, wider family 38mm to 44.25mm

Who it suits

For the buyer who wants one recognisable chronograph with real history behind it rather than a wardrobe of them.

See every Speedmaster we have