Fake drive 39mm is the search phrase for a replica of the Cartier Drive de Cartier Extra-Flat, the cushion-shaped dress watch Cartier launched in 2016. The genuine watch measures 39 mm by 40 mm and stands 6.6 mm tall. That height is the number that matters most. Nearly every replica gets the 39 mm footprint close and gets the 6.6 mm profile wrong, often by 2 mm or more, because the factory built the case around a thick automatic movement instead of a thin manual-wind calibre.
Reference Specs to Compare Against
Fix the genuine numbers in your head before you judge any replica. A steel Drive Extra-Flat should match this list:
Fake Drive 46mm: Case Size, Model Match, and Checks
- Case: 39 mm by 40 mm, cushion shape with brancard flanks
- Thickness: 6.6 mm
- Movement: Calibre 430 MC, manual winding, roughly 38 hours of reserve
- Dial: stamped guilloche pattern, Roman numerals, small seconds at 6 o'clock
- Crown: octagonal, set with a blue sapphire cabochon
- Crystal: sapphire with anti-reflective coating
- Water resistance: 30 m, or 3 bar
- Caseback: solid, no display window
Tools You Need
- Digital calipers that read to 0.01 mm
- A 10x jeweler loupe
- A timing machine if you plan to check rate and beat error
- A soft cloth and a clean, well-lit work surface
How to Inspect a Replica Drive 39mm
- Measure the case thickness at the flattest point of the caseback and confirm the reading falls within 0.3 mm of 6.6 mm.
- Measure the case across its widest span and verify the 39 mm figure, then measure the other axis for the 40 mm figure.
- Wind the crown between finger and thumb and listen for rotor noise, since a free-spinning rotor proves you are holding an automatic and not a 430 MC clone.
- Turn the watch face down, tilt it side to side, and note whether anything rattles inside the case.
- Examine the crown with the loupe and count the octagonal facets, then confirm the cabochon is a deep blue and sits flush.
- Study the dial printing for sharp Roman numerals with clean edges and no ink spread between strokes.
- Hunt for the Cartier secret signature worked into one of the Roman numerals, most often the VII.
- Check the small seconds hand at 6 o'clock for correct length, a centered pivot, and a sweep that matches a 3 Hz beat.
- Inspect the caseback engraving for depth, correct font weight, and a crisp reference number rather than a shallow laser etch.
- Run the watch on a timing machine and record the rate at three positions before you decide.
Red Flags
- Case thickness above 7.5 mm
- Dial that is flat printed instead of stamped with a raised pattern
- Mineral glass or a sapphire crystal with a purple or green cast under light
- Round crown or a glued-on cabochon that sits proud of the surface
- Rotor whir when the watch is shaken
- Clasp and strap hardware with no brand stamp or with a blurred stamp
- Caseback screws that are uneven in depth or strip under light pressure
Movement Choices Inside Replicas
Thin manual-wind replicas are rare. Most 39 mm Drive copies hide a Miyota 9015 or a generic Chinese automatic, which is why the case swells past 8 mm. A smaller group uses a hand-wound clone that copies the layout of the 430 MC, and those watches come much closer to the genuine silhouette. Ask which movement sits inside before you buy, and treat a seller who cannot name it as a seller who does not know the product.
What a Replica Cannot Copy
The 430 MC descends from a Piaget base, and its thin gear train is the reason the genuine watch stays at 6.6 mm. No replica factory in this price band machines that movement. The dial finish is the second gap. Cartier stamps the pattern into the metal before finishing, while replicas print or stamp it more shallowly, so the light catches it differently at an angle. Hand finishing on the brancards and the crisp inner angles of the cushion case round out the differences you can spot without opening the watch.