Rolex · Authentication
GMT-Master II: real vs fake
The GMT-Master II — “Pepsi” (red-blue) and “Batman” (blue-black) — is defined by its two-tone Cerachrom bezel, and that is exactly what sinks most replicas. The genuine insert is a single piece of ceramic with a razor-sharp color boundary. Then comes the mechanics: the 24-hour hand and an independently jumping hour hand.
What to check on the GMT-Master II
Model-specific zones — on top of the brand-level signs.
One-piece two-tone ceramic
The bezel insert is a single piece of Cerachrom, not two glued halves: the color boundary is crisp, with no step and no pigment bleed. A seam, a height change, or a blurry transition is an instant fail.
Pepsi and Batman shades
Pepsi red reads muted burgundy in shadow and scarlet in light; the blue is deep with no purple drift. Replica red often turns acid pink, while the blue shifts violet or washes out.
24-hour hand and bezel scale
The GMT hand’s triangular tip must point precisely at the 24-hour bezel graduation for the second time zone. The tip is lume-filled and color-matched to the insert.
Independent hour hand
With the crown in the middle position, the local hour hand jumps in one-hour steps forward or back while the seconds keep running and the 24-hour hand keeps moving. On replicas the hands are usually linked — this is the key mechanical test.
Bidirectional 24-click bezel
Unlike the Submariner, the GMT bezel rotates both ways with 24 detents per revolution — one per hour. Free spinning with no detents, or 120 clicks, points to a donor case.
Photo angles for the check
- 1 Dial
- 2 Caseback
- 3 Crown
- 4 Bracelet
- 5 Serial number
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FAQ
How many clicks does a GMT-Master II bezel have, and which way does it turn?
The bezel is bidirectional with 24 clicks per full revolution — each click equals one hour on the 24-hour scale. A 120-click or counterclockwise-only bezel belongs to another model or a replica.
How do I verify a true GMT movement?
Pull the crown to the middle position and turn it: the hour hand should jump in exact one-hour steps independently of the minute and 24-hour hands, with the seconds never stopping. If all hands move together, it is not the original caliber.
Is checking a Pepsi different from a Batman?
Same logic: one-piece ceramic, sharp boundary, correct shades. On the Batman, additionally study the blue/black split — on replicas it is often nearly invisible or, conversely, far too contrasty and bright blue.