Short answer
Cartier built the Ballon Bleu de Cartier 24 mm as a quartz watch. There is no mechanical 24 mm Ballon Bleu. A counterfeit at this size copies the case shape, the guilloche dial, and the fluted crown. It cannot copy the movement. Check the hands, the cabochon, and the case back engraving. Those three points settle most questions.
Genuine 24 mm specifications
- Case: steel, 24 mm across.
- Movement: quartz, Cartier calibre 057.
- Hands: hour and minute only. No center seconds hand.
- Dial: guilloche pattern, Roman numerals, blued steel sword hands.
- Crown: fluted, tipped with a domed synthetic blue spinel cabochon.
- Crystal: sapphire.
- Water resistance: 30 m.
- Case back: reference number and the Swiss Made mark.
Three checks that find a fake
- Hands. The genuine 24 mm quartz runs two hands. A counterfeit at this size often adds a center seconds hand, because the donor movement is a cheap three-hand quartz caliber. A ticking seconds hand on a 24 mm Ballon Bleu is a mismatch.
- Cabochon. The genuine stone is a domed synthetic blue spinel. Fakes use glass or resin. Look for bubbles, a flat top, or a bright blue that reads lighter than the deep blue of the real stone.
- Engraving. Genuine case back text is cut deep, sharp, and even. Counterfeits show shallow laser etching, soft edges, and wrong letter spacing. The guilloche on a fake shows a moire pattern, and the Roman numerals look ragged under a loupe.
Weight and finish
A steel 24 mm Ballon Bleu on a bracelet has a solid feel and no rattle when shaken. The end links sit flush against the case with no gap. The clasp closes with a firm click. Counterfeits at this size show play in the end links and a hollow sound when tapped.
Price and legal status
A new genuine 24 mm steel Ballon Bleu lists in the low four thousands of US dollars. Counterfeits sell for a small fraction of that number. The price gap is the first signal that a listing is not what it claims.
Counterfeit watches are illegal to import into the United States. U.S. Customs and Border Protection seizes them and destroys them. Trafficking in counterfeit goods carries up to 10 years in prison and a $2,000,000 fine for an individual on a first offense under 18 U.S.C. Section 2320. Selling or buying can also bring civil liability under the Lanham Act. Cartier does not service counterfeits and does not supply parts for them. A counterfeit 24 mm Ballon Bleu has no resale path, no service history, and no warranty.