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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The modern stainless-steel Omega Speedmaster Calibre 321 is a 39.7 mm chronograph, reference 311.30.40.30.01.001, inspired by the ST 105.003 worn by astronaut Ed White during the first American spacewalk. It revives a historically important movement in a newly made watch; it is not a vintage ST 105.003, nor is this reissue itself a space-flown watch.
What the modern Speedmaster 321 is
Omega identifies the 2020 steel model as reference 311.30.40.30.01.001. Its inspiration is the third-generation Speedmaster ST 105.003 associated with Ed White’s 1965 spacewalk. That connection is about design and historical lineage, not the provenance of the newly made watch. Omega’s historical account describes how the reissue was developed.
The reference matters because “Speedmaster 321” can also mean other current watches in Omega’s Calibre 321 family, or original vintage watches. The steel reissue is the specific subject here; an actual ST 105.003 is a vintage watch with its own age, condition and provenance, while the modern model is a contemporary production piece.
Design and specifications
Omega’s catalog lists the steel model with a 39.7 mm case and a black step dial. Its polished black ceramic (ZrO2) bezel ring carries a white-enamel tachymeter scale. The catalog also describes Moonwatch hands and a vintage Omega logo. These are manufacturer-listed details, not independent measurements or wear-test observations. Omega’s product listing gives the specifications.
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| Specification | Omega-listed detail |
|---|---|
| Reference | 311.30.40.30.01.001 |
| Case diameter | 39.7 mm |
| Movement | Calibre 321, manual winding |
| Power reserve | 55 hours |
| Frequency | 2.5 Hz |
| Dial and bezel | Black step dial; polished black ceramic bezel ring with white-enamel tachymeter scale |
| Hands and logo | Moonwatch hands; vintage Omega logo |
The 55-hour reserve and 2.5 Hz frequency are catalog specifications, not results from independent testing. The figures help identify the movement, but they do not establish how long a particular watch will run between windings under a wearer’s use.
Why Calibre 321 matters
Calibre 321 is not just a modern movement name attached to a vintage-styled watch. Swatch Group described it in 2019 as the first movement used in the Speedmaster, introduced in 1957. Its announcement links the ST 105.003 generation to NASA qualification and Ed White’s first American spacewalk. Swatch Group’s announcement provides that account.
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Omega’s historical material also connects the original 321 with early Speedmasters and watches worn on the Moon. That broader history should not blur the specific story of this steel reissue: its stated design inspiration is the Ed White-era ST 105.003, and the reissue itself should not be described as having flown in space. Omega’s Moonwatch history explains the brand’s account of the movement’s lunar-era role.
How Omega recreated the movement
Omega says it established a dedicated Calibre 321 workshop in Biel and that a team spent two years rebuilding the movement. The company also says tomography of Gene Cernan’s Moon-worn Speedmaster helped establish the original movement’s dimensions. Those details describe Omega’s development account, rather than an independently documented teardown or test of the modern steel watch.
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How it differs from other 321 Speedmasters
The steel reference is one member of a broader current Calibre 321 family. Omega’s catalog identifies steel, Canopus Gold and platinum versions, but the existence of those editions does not make them interchangeable with the specific Ed White-inspired steel model. The steel model’s catalog page is the appropriate reference for its material and specification details.
- Choose the steel 311.30.40.30.01.001 if the target is the modern stainless-steel reissue with the ST 105.003-inspired design.
- Consider another current 321 edition if precious-metal case material is central to the choice; confirm the individual model’s specifications with Omega.
- Look at a vintage ST 105.003 if the objective is an original period watch rather than a modern recreation. Its originality, condition and provenance need to be assessed as characteristics of that particular vintage example.
For a direct product search, use the full reference, 311.30.40.30.01.001, or “Omega Speedmaster Calibre 321 stainless steel.” Check regional listings for current stock, seller credentials and price: those details are not established here and can change.
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