Reference 33704 is a Cartier case number stamped on the back of some Ballon Bleu de Cartier watches. It is not a model name, and it does not prove a watch is authentic or counterfeit. Copy makers reproduce case-back text, so the number appears on genuine watches and on reproductions sold as 1:1 or super clone builds.
What the number 33704 covers
Cartier uses two sets of numbers. The W number, for example W69012Z4, appears on the certificate and the box. The case reference is a shorter number engraved on the caseback. 33704 belongs to that second group. Cartier does not publish a table that maps case references to model, size, or production year. That gap is why the number circulates on resale listings with no supporting source. Only a Cartier boutique or service center can confirm which model a given caseback number shipped on.
Where counterfeit Ballon Bleu watches fail inspection
Most tells sit within arm's length of the case.
- Cabochon: the crown at 3 o'clock is capped with a blue sapphire set inside a metal guard. Copies use glass or plastic. The fake stone reads flat, shows bubbles, and has no depth under a light.
- Crown guard: genuine guards are polished with sharp transitions into the case band. Copies show soft edges, tool marks, or plating that flakes at the gap.
- Dial: the guilloché pattern on a genuine dial is cut into the metal. Copies print the texture or stamp it shallow. Text such as Cartier and Swiss Made holds crisp edges under a 10x loupe. Fake printing bleeds.
- Hands: genuine hands are blued steel with a mirror finish. Copies are painted blue and show brush lines.
- Caseback engraving: genuine numbers are stamped into the metal. Fake numbers are laser etched, shallow, and repeat across units from the same seller.
- Movement: 36mm and 42mm automatics run Cartier caliber 049, an ETA 2892-A2 base. That movement beats at 28,800 vibrations per hour, or 8 beats per second. A quartz copy ticks once per second. A low grade automatic copy runs coarse and loses minutes per day.
- Bracelet: genuine steel links are held with slotted screws. Copies use friction pins or glued links. Gold plating wears through to base metal at the clasp within months of daily wear.
How to check one in hand
- Watch the seconds hand for 30 seconds. A smooth 8 beat sweep points to a mechanical movement. One tick per second points to quartz.
- Hold the cabochon under a desk lamp and rotate the watch. Sapphire shows internal depth and no bubbles.
- Read the caseback with a loupe. Stamped digits leave raised metal at the edge. Laser etching looks burned.
- Match the caseback serial to the paperwork. Copies reuse one serial across a run, so a search for that number returns many watches for sale. That is a red flag.
- Have a watchmaker open the back. Check rotor engraving, bridge finishing, and the balance wheel.
Price and US law
Used steel Ballon Bleu watches trade near $3,500 to $6,500 on the secondary market, and the figure moves with size, metal, box, and papers. Replica prices run from about $50 for a quartz copy to several hundred dollars for a higher grade automatic copy.
Under US law, 18 U.S.C. § 2320 makes trafficking in counterfeit goods a federal crime. CBP can seize counterfeit watches at import, and 19 U.S.C. § 1526 bars importation of merchandise bearing a counterfeit mark. A personal-use claim does not make the import legal.
What 33704 does not tell you
The number says nothing about metal content, movement, or case size on its own. Listings that present it as proof of a specific build are repeating digits copied from a caseback. Ask for a Cartier service record, or price a service quote from a watchmaker, before you commit money.