What "Ballon Bleu 33660" actually points to

Short answer: 33660 is not a Cartier reference number. Cartier stamps its own codes in a different format (W69012Z4 and shapes like that), so a listing tagged 33660 is using a seller or factory SKU. In practice that number lands on a steel Ballon Bleu in the 33mm or 36mm range, blue spinel cabochon crown, matching steel bracelet, automatic movement. Someone searching "fake Ballon Bleu 33660" is usually chasing one batch from one factory, not one watch model. The same digits get reused across batches, so treat it as a starting point and verify the actual specs with the seller.

Pin down the size first

Cartier builds the Ballon Bleu in several widths, and the case size changes everything about how the watch wears. The 33mm automatic is the most copied, followed by the 36mm. A 33mm sits close on a 6.5 inch wrist and reads almost like jewelry. A 36mm is the safer pick for a 7 inch wrist or larger.

Ask for a photo of the case with calipers across the bezel, plus a photo of the caseback. Lug to lug and thickness matter too. Fakes often run a little thick because the movement and spacer take more room than a genuine Cartier calibre does.

The movement question

This is where price tiers separate. The cheapest 33660 batches carry a basic Asian automatic, often with a rough winding feel and a date that flips late. Mid tier builds typically use a Miyota 9015 or a Seagull ST21 series clone. Top tier sellers fit a Swiss ETA base or a well finished clone and decorate the rotor to mimic Cartier finishing.

Geniune 33mm automatics run a Cartier calibre built on an ETA 2892 base, which is thin. That thinness is hard to fake. If a seller quotes a 12mm thick 33mm Ballon Bleu, the proportions are off.

Dial and case details buyers miss

  • The cabochon crown: genuine stones are a deep, even blue synthetic spinel set into a fluted crown guard. Look for a milky or purple tint and a flat, glued look.
  • Guilloché texture: the dial center should show a fine concentric swirl under angled light. Cheap prints look flat.
  • Roman numerals: check the VII, which hides the word CARTIER. Poor copies print it smudged or omit it.
  • Hands: blued sword hands should look dark blue in normal light and shift to purple under direct sun. Painted hands stay flat black.
  • Caseback engraving: crisp edges, correct font weight, serial and reference lines that do not repeat across batches.
  • Crystal: sapphire has almost no reflection haze. Mineral glass usually shows a slight fog at the edges.

Bracelet and clasp

Solid links, tight end link fit against the case, and a clasp that closes with a firm click. Older genuine references used screws on the bracelet, newer ones use push pins, so match whatever the seller claims. Cheaper builds have folded or hollow links that rattle and feel light. Weigh the watch in grams and compare.

What to ask before paying

  1. Calipers photo across the case, plus thickness.
  2. A short video of the second hand sweep and the winding action.
  3. Timegrapher numbers if the seller has one.
  4. Weight in grams, bracelet included.
  5. Return window and who covers shipping.

Price bands and a legal note

Rough tiers: budget batches sit under $150, mid tier runs a few hundred, and Swiss movement builds push higher. Anything quoted far below the tier it claims should be treated as a mismatch. One more thing worth knowing: counterfeit watches can be seized by customs in the US and several other countries, and selling them is a separate legal problem from owning one. Know your local rules before you order.