Short answer
Most fake Speedmasters fail on three things: the reference number does not match the dial layout, the caseback text is wrong, or the seller will not show the movement. Work through those three checks first. If any one of them fails, stop the deal. You do not need to be an expert to answer the question, you need a photo set and ten minutes.
How to Buy a Genuine Speedmaster and Avoid Fakes
What you need before you start
- Clear photos of the front, caseback, both flanks, and the clasp
- The reference number printed on the papers or listing
- A movement photo with the caseback removed
- A caliber list for that reference from an official source
- A current price range for the same reference in the same condition
How to check a Speedmaster, step by step
- Write down the full reference number from the listing, including the two-digit suffix after the dash.
- Compare that reference against the dial layout in the photos. Subdial position, hand shape, and bezel insert must match the reference, not a similar model.
- Look at the printed logo straight on. On a genuine dial the letters sit sharp and even, with a flat, wide base on the Omega symbol.
- Photograph the caseback with light raking across it. Engraving depth, font weight, and spacing vary on fakes, and the text often sits shallow or uneven.
- Ask for a movement photo. A Speedmaster should show a caliber that was actually used in that reference, with clean finishing and legible stamps.
- Read the serial and movement number against known production ranges for that era.
- Run the chronograph. Start, stop, and reset it twice. The pushers should feel firm and the reset should snap back to zero without drift.
- Measure the case with calipers and weigh it. Case diameter, thickness, and lug width are fixed numbers for each reference.
- Check the papers. Warranty card numbers, box label, and caseback serial should all agree.
- Price the reference against current sold listings. A price far under market is the oldest signal there is.
Red flags that answer the question for you
- Subdials pushed toward the center on a dial that should have them wide apart
- Caseback text that is too bold, too light, or spaced wrong
- A caliber stamp for a movement that never shipped in that reference
- The same serial number showing up on a second listing
- A seller who refuses a movement photo or a return window
- A seller who calls the watch a replica only after you ask about the serial
If you cannot inspect in person
Ask for a short video instead of stills. Have the seller start the chronograph, flip the watch over, and read the caseback text out loud. Video is hard to fake and stills are easy to borrow from another listing. When the seller will not produce it, treat the question as answered and walk away.