Is your Moonwatch
the real deal?
The Omega Speedmaster Moonwatch Professional is the most iconic chronograph ever made — the first watch worn on the moon. Its legendary status and enduring popularity make it a prime target for counterfeiters. The current Caliber 3861 version demands careful authentication. Here's how to tell the difference.
How to authenticate a Speedmaster Moonwatch
Hesalite Crystal with Ω Logo
The standard Moonwatch Professional uses a hesalite (acrylic) crystal, not sapphire. A key authentication marker is the tiny Omega logo (Ω) applied on the inside of the hesalite crystal at the center. You can see it with a loupe or by breathing on the crystal — your breath will reveal the logo. Counterfeits use mineral glass and almost never replicate this interior logo detail correctly.
Stepped Dial Texture
The current Moonwatch dial features a distinctive "step" — a raised central area that sits slightly higher than the outer ring where the subdials are located. This stepped dial is a hallmark of the modern 3861 Moonwatch. The dial surface should have a matte black finish with no gloss. Counterfeits often have a flat dial without the step, or they get the height difference wrong, making it too subtle or too pronounced.
Dot-Over-90 Bezel Marking
On the tachymeter bezel, the "90" marking has a small dot positioned above it. This "dot over 90" (DON) is a well-known authentication detail on genuine Speedmaster Moonwatches. The bezel should be anodized aluminum (not ceramic) with white markings on a black background. Check that the "TACHYMETRE" or "TACHYMETER" text and all numerals are crisp and properly spaced. Fakes often miss the dot or use incorrect bezel fonts.
Applied Omega Logo
The Omega logo (Ω) at 12 o'clock on the dial is an applied (raised, three-dimensional) metal emblem, not printed. It should be cleanly attached with crisp edges and a polished or brushed finish that catches light. Below it, "OMEGA" is printed in a specific font. On fakes, the logo may be flat/printed, poorly attached, slightly crooked, or have rough edges visible under magnification.
Caliber 3861 Master Chronometer
The current Moonwatch houses the Caliber 3861, a Co-Axial Master Chronometer hand-wound movement. On the sapphire sandwich variant, the movement is visible through the display case back — look for the Geneva waves (côtes de Genève) finishing and the "3861" designation. On the hesalite version, the solid case back features the seahorse medallion and mission patch engravings. The movement should wind smoothly with a firm, precise feel.
Pushers & Crown Feel
The Moonwatch has two chronograph pushers flanking the crown. Both pushers and the crown should feel firm, precise, and satisfying to operate. The pushers should have a crisp click with no lateral play. The crown should screw down smoothly (not cross-threaded) and wind with a consistent resistance. Fakes often have mushy, loose pushers with excessive side-to-side play and a crown that feels gritty or loose when winding.
Moonwatch counterfeit warning signs
Flat Dial Without Step
The current-generation Moonwatch (Caliber 3861) has a stepped dial where the central portion is raised above the outer subdial ring. This is one of the easiest authentication checks — view the dial from the side at an angle. If the dial is completely flat with no visible step between the center and the outer ring, the watch is either counterfeit or an older reference (which would have different dial text and reference numbers).
Mineral Crystal Instead of Hesalite
The standard Moonwatch uses hesalite (acrylic), which is warm to the touch, can be polished to remove minor scratches, and has a very slight dome. Counterfeit watches often use mineral glass, which is cold to the touch, harder, and perfectly flat. Tap the crystal gently with a fingernail — hesalite produces a soft, dull sound, while mineral glass has a sharper, higher-pitched tap. Also check for the interior Omega logo, which is unique to genuine hesalite crystals.
Incorrect Bezel Font or Markings
The tachymeter bezel on a genuine Moonwatch uses a very specific font for the numerals and "TACHYMETRE" text. Counterfeits frequently use a slightly different typeface — too bold, too thin, or with incorrect spacing. Check the dot-over-90 marking, the spacing between "TACHYMETRE" and "BASE 1000," and the position of all numerals. The bezel insert should be anodized aluminum, not ceramic — ceramic would indicate either a fake or a different Speedmaster model.
Poor Subdial Spacing & Alignment
The Moonwatch has three subdials: small seconds at 9 o'clock, 30-minute counter at 3 o'clock, and 12-hour counter at 6 o'clock. On a genuine Speedmaster, these are precisely positioned with even spacing from the dial center and from each other. The subdial hands should be centered within their registers. Counterfeits often have subdials that are slightly off-center, unevenly spaced, or with hands that do not sit properly within the register tracks.
Scan your Moonwatch now
Upload a few photos and get an AI-powered authenticity report in seconds. Your first scan is free.
Start ScanningFor high-value purchases, we recommend pairing your AI scan with an in-person inspection by a certified watchmaker for complete peace of mind.
Frequently asked questions
What is the difference between the hesalite and sapphire sandwich Moonwatch?
The standard Moonwatch Professional (Ref. 310.30.42.50.01.001) has a hesalite (acrylic) crystal on the front and a solid steel case back with the seahorse medallion. The sapphire sandwich variant (Ref. 310.30.42.50.01.002) has a sapphire crystal on the front and a sapphire display case back that reveals the Caliber 3861 movement. Both use the same Co-Axial Master Chronometer 3861 movement. The hesalite version is considered the more historically faithful model, as it matches the crystal used on the original Apollo-era Speedmasters.
How does the Moonwatch Professional differ from the Racing and Reduced?
The Moonwatch Professional is the flagship hand-wound chronograph (currently Caliber 3861), directly descended from the NASA flight-qualified Speedmaster. The Speedmaster Racing is a sportier variant with an automatic movement and tachymeter bezel variations. The Speedmaster Reduced (now discontinued) was a smaller, automatic version at 39mm with a different movement (Caliber 3220). The Moonwatch is 42mm with a manual-wind movement, which is the key distinguishing feature when authenticating.
Why is the Speedmaster called the Moonwatch?
The Omega Speedmaster was chosen by NASA in 1965 as the official watch for all manned space missions after surviving rigorous testing. It was worn by Buzz Aldrin during the Apollo 11 moon landing on July 20, 1969, making it the first watch worn on the moon. It also played a critical role in Apollo 13, when astronauts used its chronograph to time a crucial 14-second engine burn. The current Moonwatch Professional continues this legacy with the modern Caliber 3861 movement while maintaining the iconic design.