Answer

Omega does not make a Globemaster Worldtimer. The Globemaster line started in 2015 as the Constellation Globemaster, a 39 mm Master Chronometer with a pie-pan dial. The world map dial belongs to the Seamaster Aqua Terra Worldtimer, released in 2017. Replica sellers merge the two names because both keywords pull search traffic. A listing with that title is a copy of one model or the other, or a custom build from a workshop.

What the listing shows

  • Aqua Terra Worldtimer case, 43 mm, printed map, 24-city ring.
  • Globemaster case, 39 mm, pie-pan dial, fluted tungsten carbide bezel, no map.
  • Hybrid builds: a Globemaster case with an aftermarket world map dial. Omega has no reference number for this.

Movements

Genuine Globemaster and Worldtimer watches run Co-Axial Master Chronometer calibers 8900, 8901, 8922, or 8938. Each passed the 8 METAS tests and resists 15,000 gauss. Replicas use Miyota 8215, Sea-Gull ST21, or Hangzhou 6460 base movements with added plates and engraved rotors. The decorative bridges hide the balance wheel and the regulation screws. Timegrapher rates land near +15 to +25 seconds a day. A Master Chronometer runs 0 to +5 seconds a day.

Calendar and world time

Replica annual calendar modules sit on top of a base movement. The month and date windows move on one gear. They lose sync after the first month change. Worldtimer replicas print the city ring on the dial. A few have a working 24-hour disk. City alignment against the 24-hour scale is off by 1 to 3 hours on most units.

Case and dial checks

  • Bezel: real Globemaster uses tungsten carbide, gray with a fine grain. Replicas use polished steel or chrome plate.
  • Case size: 39 mm Globemaster, 41 mm Annual Calendar, 43 mm Aqua Terra Worldtimer. A 40 mm listing is wrong.
  • Dial print: the Globemaster puts "Master Chronometer" at 6 o'clock. Replicas place it at other spots.
  • Caseback: real watches show the 8-pointed METAS star and an 8-digit code.

Price and legal status

Replica prices run $180 to $600. Steel Globemaster models run $6,000 to $9,000. Aqua Terra Worldtimer models run $9,000 to $25,000 in titanium and gold. US Customs can seize counterfeit watches under 19 U.S.C. 1305. Buyers get no warranty and no service parts.