A fake Rolex GMT-Master II 16710 usually gives itself away in four places: the hand stack, the bezel insert printing, the movement's setting behavior, and the engravings between the lugs. The genuine reference was produced from 1989 to 2007 with a 40 mm case, an aluminum bezel insert, a sapphire crystal, and caliber 3185 or 3186 inside. Replicas copy the outline well and miss the mechanics underneath, so most authentication work is done with your hands and eyes, not a loupe.
What the 16710 Actually Is
The 16710 replaced the 16760 and ran until the 116710 took over in 2007. It came with three insert colors: black, red and black (Coke), and blue and red (Pepsi). Early dials carry tritium and read SWISS T < 25. Dials from roughly 1998 onward use Luminova or Super-LumiNova and read SWISS MADE. Lug width is 20 mm, and most examples ride on an Oyster bracelet stamped 78790.
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Quick Checks, In Order
- Grip the bezel and rotate it both directions. A genuine 16710 turns both ways with 24 distinct clicks per full turn and no back play.
- Look at the hand stack from the side. On a genuine 3185 or 3186, the GMT hand sits at the bottom, below the hour hand. Most replica GMT movements put the GMT hand on top.
- Pull the crown to the first position and turn it. The hour hand should jump in one-hour steps, the date should follow, and the 24-hour hand should stay where it is.
- Study the bezel insert under bright light. Genuine inserts use thin, crisp serif numerals. Aftermarket inserts look thicker, and the red and blue color break often lands in the wrong spot.
- Check the crystal edge at 6 o'clock for the laser-etched coronet. Later examples have it. Early examples do not.
- Look between the lugs for the model number and serial engravings. Replicas often show shallow, uneven, or missing engraving.
- Hold the watch to your ear. A genuine movement beats eight times per second, a fast, even tick. A slow, coarse tick points to a cheap movement.
Where Most Replicas Fail
Hand stack and setting
The independent hour hand is the hardest thing for a replica maker to copy. If the GMT hand moves when you set the hour, or if the hour hand sweeps instead of jumping, the movement is not a 3185 or 3186.
Bezel insert
The insert is the most visible part of the watch and the most commonly swapped. Genuine inserts have a specific numeral shape on the 2, 4, 8, 10, and 22, and the paint sits flush. Aftermarket inserts show raised paint and rounded corners.
Case and bracelet markings
Engravings between the lugs are stamped, not laser printed. Clasp codes and end link stamps should match the bracelet the reference shipped with.
Legal and Buying Notes
In the United States, selling a watch as a Rolex when it is not one is trademark infringement and can carry criminal penalties. U.S. Customs and Border Protection seizes counterfeit watches at import. A watch openly sold as a first copy is a different product from a watch passed off as genuine, and the two should never be confused by a buyer. If you are shopping for the GMT-Master look, know the reference numbers and ask for clear photos of the hand stack, insert, and case back before you pay.