Short answer
33681 is not a Cartier reference number. Cartier Ballon Bleu references start with W. The 33 mm steel automatic is W6920071. Listings that use 33681 are seller codes, batch labels, or size tags. The number says nothing about who built the watch or where.
What the Ballon Bleu is
Cartier launched the Ballon Bleu de Cartier in 2007. The case is round and inflated in profile. The crown sits at 3 o'clock inside a curved guard. A blue sapphire cabochon caps the crown. The dial carries guilloché texture, Roman numerals, and blued steel sword hands. Cartier hides its secret signature inside the VII numeral. Steel versions come in 33 mm, 36 mm, and 42 mm. Water resistance is 30 m on most steel models. A new steel 33 mm automatic sells for about $6,000 and up from an authorized dealer.
Real references and movements
- 33 mm automatic: calibre 076, base ETA 2671, 28,800 vph.
- 36 mm automatic: calibre 049, base ETA 2892-A2, 28,800 vph.
- 42 mm extra flat: calibre 430 MC, base Piaget 430P, hand wound.
Both automatic calibres beat at 4 Hz. The second hand makes 8 steps per second. A quartz movement or a 21,600 vph movement in a Ballon Bleu case does not match the genuine build.
Checks on the case
- Cabochon. Genuine uses a faceted blue sapphire. Copies use glass or synthetic spinel. Look for light return and a clean facet edge. A cloudy or flat blue stone points to a copy.
- Crown guard. The genuine guard flows out of the case with no seam. A visible joint or a thick lip is a copy sign.
- Caseback. Check engraving depth, font, and spacing. Reference and serial numbers should match the papers. Blurred laser etching is common on copies.
- Weight and metal. Steel cases feel dense in the hand. A plated brass case weighs less and shows wear at the lugs and crown guard.
- Bracelet. Links are polished on the center and satin on the sides. Screws sit flush. Proud or slotted screws are a copy sign.
Checks on the dial
- Guilloché lines run without breaks. Copies show a stamped pattern that fades near the date window.
- Roman numerals have sharp edges. The VII numeral holds the word CARTIER. On copies the letters are absent or cut off.
- Hands are heat blued steel, not paint. Paint shows a flat color and chips at the tips.
- Date font matches the dial printing. Copies use a generic font and a wider aperture.
Limits of photos
A photo can confirm a dial mismatch. A photo cannot confirm beat rate, weight, or engraving depth under light. Ask for a timegrapher reading and a movement photo with the caseback open. Sellers who hold the keyword 33681 as proof of origin are making a claim they cannot support.
Legal status in the US
Import of goods that carry a counterfeit trademark is prohibited under 19 U.S.C. 1526. US Customs and Border Protection can seize the shipment. The buyer loses the goods and the money. Counterfeit watch sales also fund other illegal trade, per the Federation of the Swiss Watch Industry.