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Authentication Guide · Omega · 311.30.42.30.01.005, 310.30.42.50.01.001

Spotting a Fake Omega Speedmaster Professional

Learn to identify counterfeit Omega Speedmaster Professional watches with detailed checks on the 311.30.42.30.01.005 and 310.30.42.50.01.001 models.

Omega Speedmaster Professional
Photo: Auge=mit · CC BY-SA 4.0 · source
By Catch Fakes Authentication Desk4 min read

The Omega Speedmaster Professional, often referred to as the 'Moonwatch', is one of the most iconic timepieces in horological history. Its association with NASA's lunar missions has made it a highly sought-after model, particularly the references 311.30.42.30.01.005 and 310.30.42.50.01.001. Unfortunately, this popularity has also led to a proliferation of counterfeits. Being duped by a fake can lead to a significant financial loss, as these watches often retail for several thousand pounds. Understanding the nuances of these specific references is crucial for collectors and enthusiasts aiming to invest in authentic pieces.

The Dial Printing

The dial of the Omega Speedmaster Professional should exhibit crisp and precise printing. The 'Omega' logo and 'Speedmaster' script should be sharp, with no bleeding or fuzzy edges. On the 311.30.42.30.01.005, the sub-dials should be symmetrically aligned and the minute markers should be evenly spaced. On the newer 310.30.42.50.01.001, look for the co-axial chronometer text, which should be perfectly centred and aligned.

Movement Caliber

The 311.30.42.30.01.005 houses the Omega Calibre 1861, a manual-winding movement known for its reliability. The 310.30.42.50.01.001 features the Calibre 3861, which includes a co-axial escapement. Authentic movements will have a distinct finish and decoration, with the 3861 showcasing rhodium-plated surfaces and Geneva waves. Counterfeits often use generic movements that lack these intricate details.

Caseback Engravings

The caseback of the Speedmaster Professional is a key area for authentication. The 311.30.42.30.01.005 should have 'Flight-Qualified by NASA for All Manned Space Missions' and 'The First Watch Worn on the Moon' engraved. The 310.30.42.50.01.001 includes similar text but with updated fonts and spacing. The engravings should be deep and precise, not shallow or uneven.

Bracelet End-Links and Clasp

The bracelet on these models should be solid and well-finished. The 311.30.42.30.01.005 typically uses the bracelet code 1998/849, while the 310.30.42.50.01.001 uses 020STZ011626. The end-links should fit snugly against the case without gaps. The clasp should have a smooth action and the Omega logo should be sharply defined.

Bezel Insert

The bezel insert on the Speedmaster Professional is made of aluminium. The tachymetric scale should be clear and precise. The dot over ninety (DON) is a historical feature found on vintage models, but modern references like the 311.30.42.30.01.005 and 310.30.42.50.01.001 will have the dot next to ninety. Any misalignment or poor printing is a red flag.

Lume Colour and Application

The lume on the Speedmaster Professional should be evenly applied and glow brightly in low light. The 311.30.42.30.01.005 typically uses Super-LumiNova, which emits a green glow. The 310.30.42.50.01.001 also uses Super-LumiNova but may appear slightly whiter in daylight. Inconsistent lume application or incorrect colour can indicate a fake.

Weight and Sound

An authentic Speedmaster Professional has a substantial weight due to its stainless steel construction. It should feel solid on the wrist. The sound of the movement should be smooth and consistent when winding. A lightweight feel or a noisy movement can be indicative of a counterfeit.

Red Flags at a Glance

  • Blurry dial printing
  • Incorrect movement decoration
  • Shallow caseback engravings
  • Loose bracelet end-links
  • Misaligned bezel scale
  • Inconsistent lume colour
  • Lightweight feel
  • Noisy movement

FAQ

How can I verify the movement in my Speedmaster?

Check for the Omega Calibre 1861 or 3861. Look for specific decorations like rhodium plating and Geneva waves.

What should the caseback say on an authentic Speedmaster?

It should have 'Flight-Qualified by NASA for All Manned Space Missions' and 'The First Watch Worn on the Moon' engraved.

How do I check the bracelet authenticity?

Look for the correct bracelet codes (1998/849 or 020STZ011626) and ensure the end-links fit snugly against the case.

What is the lume colour on a genuine Speedmaster?

The lume should glow green on the 311.30.42.30.01.005 and may appear slightly whiter on the 310.30.42.50.01.001.

Is the weight of the watch a reliable indicator?

Yes, an authentic Speedmaster should have a substantial weight due to its stainless steel construction.

Final Word

Authenticating an Omega Speedmaster Professional requires attention to detail and knowledge of the specific characteristics of the 311.30.42.30.01.005 and 310.30.42.50.01.001 models. While this guide provides a comprehensive overview, seeking a second opinion from a professional watchmaker or an authorised Omega dealer can offer additional assurance. Remember, a genuine Speedmaster is not just a timepiece; it's a piece of history.


Want a second opinion in seconds? Watch Authenticator scans a photo and runs the same checks — dial, crown, rehaut, caseback, movement — flagging anything off. Try it →