Short Answer
A fake Omega Speedmaster Gray Side of the Moon is judged on four things: the ceramic case finish, the subdial layout, how the chronograph behaves, and the finishing and engraving on the movement. A steel case with a gray coating and a three register dial fails at the first check. A copy with a sand-blasted ceramic case, a flush bezel insert, and a two register dial can survive a casual glance and still fail under a loupe. Work the checks below in order and the two separate fast.
Prerequisites
- Calipers and a digital scale
- A 10x loupe or a phone macro lens
- A bright light you can angle low across the case
- Omega's published specs for the reference you are checking
- Macro photos of the dial, caseback, and movement from the seller
How to Judge a Replica Gray Side of the Moon
- Measure the case across the bezel with calipers. The genuine case is 44.25 mm, so a reading near 43 mm or 45 mm means the wrong case was used.
- Weigh the watch head on the scale. Real gray ceramic feels light for a 44 mm chronograph. A copy that feels dense and cold like steel is a steel case under a coating.
- Tilt the case under a low light source. Genuine sand-blasted ceramic shows a fine, even grain with no buffing swirls and no orange peel.
- Inspect the bezel insert. The genuine tachymeter scale sits flush in the ceramic with a soft metallic sheen. Replicas print or glue the scale, so it sits proud, looks flat, or wears at the edges.
- Count the subdials. The genuine dial runs two registers: a combined chronograph hour and minute counter at 3 o'clock and running seconds at 9 o'clock, with the date at 6 o'clock. Three subdials or a date at 3 o'clock is wrong.
- Examine the hands and markers through the loupe. Genuine hands and applied indexes are 18K white gold. Replicas use steel, which reads duller and shows softer edges and thicker paint.
- Check the date window. Font, position inside the aperture, and alignment with the dial axis should all be sharp and centered.
- Work the chronograph. Start, stop, and reset it five times. Pushers should feel firm and repeatable, and the counter hands should snap back to zero without drifting.
- Flip the watch over. A genuine caliber 9300 shows a column wheel, a Si14 balance spring, and striped finishing under the sapphire back. Replicas show stamped plates and engraving with the wrong font weight.
- Read the engraving on the caseback ring. Letters should be cut into the ceramic at even depth with no paint bleed and no blurred edges.
- Study the strap and clasp. The original shipped on a gray leather strap with a folding clasp, so look for even stitching, clean edge paint, and crisp clasp engraving.
- Request a live video with the seconds hand running and the chronograph engaged before you pay. Stock stills hide a dead chronograph.
Where Replicas Fail Most Often
- Coated steel cases that chip at the lugs and reveal gray metal underneath
- Printed bezel scales that sit above the ceramic surface
- Three register dials borrowed from a different Speedmaster reference
- Steel hands and markers that look flat next to white gold
- Date wheels with the wrong font or an off-center aperture
Movement Checks That Matter
A chronograph is the hardest part of any replica to build well. Wind the watch by hand and feel for grit or a rough ratchet. Set it down and watch the seconds hand for a stutter instead of a smooth sweep. Run the chronograph for a full hour and confirm that the counter at 3 o'clock tracks real time. If the seller refuses a movement photo, treat the listing as unverified.
Before You Buy
Ask for the serial, a straight-on dial shot, and a movement shot in the same session. Listings that reuse manufacturer images, hide the caseback, or price far below the market for this reference are the ones to skip. Check your country's import rules as well, since counterfeit watches can be seized at the border and arrive with no service support.