Direct answer
A fake Speedmaster 323.10.44 fails in three places: case size, dial layout, and movement finish. The genuine reference 323.10.44.51.01.001 is a 44.25 mm steel Speedmaster Co-Axial Chronograph with a two-register dial, the date at 6 o'clock, and Omega caliber 9300 behind a sapphire caseback. Counterfeits start from a Valjoux 7750 or a decorated Chinese clone, then add Omega markings on top. Check the caseback engraving first, the subdial positions second, and the movement third. One flaw means little on its own. Three mismatches mean the watch is not genuine.
What you need
- Digital calipers that read to 0.01 mm
- 10x jeweler loupe
- Postal scale with 1 g resolution
- UV flashlight
- Macro photos of a known genuine 323.10.44.51.01.001 for side-by-side comparison
Step-by-step checks
- Set the watch flat and measure the case across the 9 to 3 line, crown excluded. The genuine case is 44.25 mm. Anything under 43.5 mm or over 45 mm ends the inspection.
- Read the caseback engraving under the loupe. The reference number 323.10.44.51.01.001 and the serial should cut into the steel with sharp edges and even depth, not sit on the surface as laser print.
- Map the dial. Genuine has small seconds at 9 o'clock, the combined 60-minute and 12-hour counter at 3 o'clock, and the date at 6 o'clock. A date window at 3 o'clock is a Valjoux 7750 tell.
- Inspect the applied OMEGA logo with 10x magnification. The genuine logo is solid metal with polished bevels, and the printed dial text has clean edges under magnification.
- Tilt the crystal toward a light source. Double-sided anti-reflective coating on the genuine sapphire gives a faint blue tint. Green or purple haze, or no tint at all, points to aftermarket glass.
- Look at the movement through the display back. Caliber 9300 shows Geneva stripes, a signed skeleton rotor, and a two-barrel Co-Axial layout. A solid steel plate or an unsigned rotor is a fake.
- Press each chronograph pusher. Genuine pushers have short, even travel and the chronograph hand starts with no jump. Loose travel and a stuttering start come from a 7750 base.
- Feel the bracelet and clasp. Genuine links fit with tight tolerance and use screws with a machined slot. Counterfeit bracelets use push pins and show side play at the clasp.
- Compare the asking price against current secondary market listings for the reference. A 323.10.44 offered far below that range is counterfeit, stolen, or both.
Dial details that fail first
Subdial spacing is the hardest thing for a counterfeit factory to copy on this reference. On the genuine dial the two counters sit inboard from the case edge with a wide, even gap, because the 9300 movement places them there. A 7750-based fake pushes the counters toward the edge and shrinks the gap. Look at the date aperture as well. Genuine printing around the window is dense and square, and the date disc font is thin with a flat top on the 1.
Case, crown and bracelet
Genuine lugs have a lyre profile with a sharp inner bevel, and the crown guards stand off the case at a consistent angle on both sides. Counterfeit cases come from a casting or a cheap CNC run, so the bevels look soft and the crown guards sit uneven. Check the crown for the Omega symbol stamped into the end and for firm threading. A crown that wobbles or threads with grit is wrong.
Serial, papers, and provenance
Ask for the serial number and the warranty card number before you meet. The two should match, and the card should carry the correct reference for this model. A watch sold with a generic box, no card, and a story about a lost receipt gives you no way to verify anything. Photograph the caseback engraving and compare the font against a known genuine example. Omega uses a consistent engraving style across the modern Speedmaster line.
When to walk away
Walk away when the seller refuses a caseback photo, when the price sits far under market, or when the serial comes back as a different reference. Walk away when the movement shows a plain plate under the display back, and when the chronograph pushers feel mushy. A genuine 323.10.44 has a documented service history and a matching card. If you cannot confirm both, treat the watch as counterfeit until proven otherwise.