Short answer: a fake Ballon Bleu 33702 is any watch sold as a Cartier Ballon Bleu de Cartier with case reference 33702 that Cartier did not make. Five checks settle the question: the case back engraving, the crown and its blue cabochon, the dial print under magnification, the movement behind the case back, and the serial number recorded in Cartier service files. A copy fails at least one of them.
What the number 33702 means
Cartier stamps a case reference on the back of each Ballon Bleu de Cartier. Reference 33702 sits on steel automatic examples of the line, and the same case number can appear behind more than one dial and bracelet combination. That detail matters when you authenticate. The reference alone proves nothing, because a counterfeit can carry the correct number and still be wrong everywhere else.
A real example also carries a serial number beside the reference. Cartier ties that serial to the case, the movement, and the original sale in its own records. A seller who cannot show a matching service document is asking you to trust a story.
Step-by-step checks
- Turn the watch over and read the case back. Genuine engraving cuts into the metal with sharp, uniform edges and consistent depth. Stamped or laser-etched copies look shallow, and the lettering often drifts out of line.
- Measure the case with calipers. Compare the width, thickness, and lug span against the reference figures for your model. Copies shave or add fractions of a millimeter, and the bracelet end links then sit proud of the case.
- Inspect the crown. The blue cabochon on a genuine Ballon Bleu sits in a rounded synthetic spinel with a smooth dome and no bubbles. Fakes use flat plastic or dyed glass with a visible seam.
- Study the dial under a 10x loupe. Check the Roman numerals, the rail track, and the secret signature in the VII. Genuine printing shows crisp edges and even lacquer. Copies show thick strokes and filled-in counters.
- Look at the date window and the date font. Cartier placement is precise, with the numeral centered in the aperture. Copies sit off-center or use a generic font that does not match the dial.
- Open the case back and examine the movement. A real automatic runs a Cartier or modified ETA base with correct rotor engraving, jewel count, and finishing. Copies use unbranded movements, printed plates, or a quartz module behind a rotor cover.
- Weigh the watch on a kitchen scale. Steel Ballon Bleu models land in a narrow weight band for their size. Copies run light because of hollow links and thin cases.
- Request the serial and reference from the seller in writing. Then ask Cartier or an authorized service center to confirm the pair. A refusal to give the serial in a message ends the deal.
How the copy tiers differ
Low-grade fakes fail on the cabochon, the dial print, and the case back in the first minute. Mid-grade copies fix the dial but keep a stamped case back and a generic movement. High-end copies reproduce the case dimensions and dial well, yet the movement finish, the serial record, and the crown assembly still separate them from a real watch under inspection or at a service bench.
Seller red flags
- Price far below the resale range for the reference and condition.
- Photos that avoid the case back, the crown, or the movement.
- Papers with a serial that does not match the case.
- Pressure to pay outside a protected method.
- No return window stated in writing.
If you already own one
Stop wearing the watch and photograph every angle. Get a written assessment from a watchmaker or Cartier service center, then use that document in a dispute with the seller or your payment provider. If the movement turns out to be a copy, do not send it in for service, because the brand will decline the work and may hold the watch for inspection.