Short answer
The number 33648 is not a Cartier reference. Cartier reference numbers for the Ballon Bleu de Cartier use a W prefix, such as W69012Z4 or W6920046. Listings that group watches under a "33648 collection" use a seller code or a factory code. Treat the number as an internal stock label. It is not proof of a model line, a size, or a movement.
What the genuine Ballon Bleu is
Cartier launched the Ballon Bleu de Cartier in 2007. The case is round. The crown sits inside a metal guard at 3 o'clock. A blue cabochon, a synthetic spinel, caps the crown. Case sizes run 28 mm, 33 mm, 36 mm and 42 mm. Steel 33 mm models retail near $5,000. Steel 42 mm models sit above $6,000. Two-hand and small-second versions exist. Quartz movements appear in the 28 mm models and in some 33 mm models. The 36 mm and 42 mm sizes use automatic movements.
Finding the Perfect Fake Ballon Bleu 33648 New: A Comprehensive Guide
Points to compare on a replica
- Case size: measure the width across the case, not the crown guard. A "36 mm" that measures 40 mm is not a 36 mm.
- Cabochon: the color should read deep blue. Pale or purple stones appear on low-grade copies.
- Crown guard: the guard must merge into the case with no seam and no step.
- Dial printing: Roman numerals must have sharp edges. Blurred edges show pad printing.
- Movement: a display back on a 42 mm copy may show a decorated rotor. The finish does not change the base movement.
- Weight: a steel 42 mm case with a bracelet weighs about 100 g. Copies sit lower because of hollow links.
- Clasp and case codes: genuine clasps carry a reference and a serial. Check that both match the case back.
Limits of any comparison
A replica will not match a genuine Ballon Bleu on movement finishing, service parts, or resale. Cartier keeps a service record tied to the case serial. A copy has no such record. In the US, selling counterfeit goods is illegal under 18 U.S.C. 2320 and the Lanham Act. Buying for personal use is a different matter, but import can lead to seizure by US Customs. No seller code changes those facts.