A fake Omega Speedmaster Moonwatch Master Chronometer fails in three places: the movement, the dial, and the caseback. The genuine watch uses the Co-Axial Master Chronometer Calibre 3861, a stepped dial, and a single line of text for the certification. A replica often uses a stock ETA or Seagull movement, a flat dial, and spelling errors on the caseback. Work through the steps below in order.

Prerequisites

Gather a 10x loupe, a bright light, a digital scale, and calipers. Have the watch's serial number ready for the Omega test database check.

Check the movement first

  1. Remove the caseback with a caseback wrench.
  2. Look for the caliber number engraved on the bridge.
  3. Confirm the number reads 3861.
  4. Inspect the finishing for Geneva stripes and polished bevels.

Genuine 3861 movements have a co-axial escapement and a silicon balance spring. A fake often shows a Seagull ST19 or a plain ETA 7750 with no co-axial parts.

Inspect the dial and hands

  1. Place the loupe over the "Omega" logo.
  2. Check the spacing and weight of the "Speedmaster" text.
  3. Read the "Co-Axial Master Chronometer" line.
  4. Compare the subdial hands to the main hands.

The genuine dial has a stepped surface and a dot over ninety on the tachymeter scale. Fake dials often have flat printing, thick fonts, and a misaligned dot.

Examine the caseback engraving

  1. Read the "FLIGHT-QUALIFIED BY NASA" text.
  2. Check the spelling of "MISSIONS".
  3. Look for the "THE FIRST WATCH WORN ON THE MOON" line.
  4. Verify the serial number is engraved, not printed.

Replica casebacks often misspell "MISSIONS" as "MISSON" or use a laser print instead of deep engraving.

Test the crown and pushers

  1. Press the top pusher to start the chronograph.
  2. Press it again to stop.
  3. Press the bottom pusher to reset.
  4. Wind the crown forward ten turns.

Genuine pushers have a crisp click and the crown threads smooth. A fake feels mushy, gritty, or loose.

Verify the Master Chronometer certification

  1. Find the movement number on the caseback.
  2. Enter the number into Omega's public test database.
  3. Confirm the eight test results appear.
  4. Check the magnetic resistance reading shows 15,000 gauss.

A genuine watch returns a full report. A fake returns no record or a mismatched number.

Check weight and dimensions

  1. Weigh the watch head on a digital scale.
  2. Measure the case diameter with calipers.
  3. Measure the case thickness.

A genuine Moonwatch Master Chronometer is 42mm wide and about 13.2mm thick. The head weighs about 80 grams. A fake often runs thicker or lighter.