Short answer
A fake Ballon Bleu 36 mm copies the Cartier Ballon Bleu case: a 36 mm round steel body, a crown guard that flows into the midcase, and a blue cabochon set in the crown. The real 36 mm steel automatic runs the Cartier calibre 076. Replicas run clone 076 movements, ETA copies, Seagull units, Miyota units, or quartz. Replica prices land between $80 and $600. Used real 36 mm steel references run about $4,500 to $7,000.
Real 36 mm specs to compare against
- Case: 36 mm diameter, about 12 mm thick, polished and brushed steel.
- Movement: calibre 076, automatic, 25 jewels, 28,800 vibrations per hour, power reserve near 42 hours.
- Crystal: domed sapphire.
- Dial: guilloché center, Roman numerals, blued steel sword hands, date at 3 on most references.
- Crown: fluted, with a faceted synthetic blue spinel cabochon.
- Water resistance: 30 m on the steel model. Older references differ.
Reference numbers on the caseback and the card should match. Numbers alone prove nothing, because replicas copy serials from photos.
Inspection points on a replica
- Cabochon. Facet count, dome height, color. Fakes show flat domes, cloudy spinel, or visible glue.
- Crown guard. The guard forms one piece with the case. Fakes show a seam or a wrong curve radius.
- Dial print. Cartier letter spacing, the Swiss Made line at 6, Roman numeral weight.
- Bracelet and screws. Real bracelets use threaded screws with a set head shape. Many fakes use pins or short screws.
- Caseback engraving. Real engraving cuts deep. Fake laser etching sits shallow and wide.
- Weight. Put the watch on a gram scale. Published weights vary by reference, so compare like for like.
Price tiers
Under $150 buys quartz or low-grade automatic movements with mineral glass. $200 to $350 buys sapphire glass, a clone 076, and better case finishing. $400 and up buys super clone builds with decorated rotors and tighter case geometry. No tier fixes the cabochon or the crown action.
What stays unknown
Factories do not publish batch codes or movement sources. Sellers rename the same build between batches. A photo set cannot confirm what ships.
Legal context in the US
US law treats a counterfeit watch as trademark infringement. Customs and Border Protection can seize imports and destroy them. Resale carries civil and criminal exposure.