The top pick for most buyers is the 33mm steel fake Ballon Bleu 33665 running a high-grade automatic movement, with a properly recessed blue cabochon crown and a dial that copies the flinqué guilloché texture instead of printing a flat pattern. That version wins because the Ballon Bleu is a small, rounded watch and every shortcut shows at arm's length: the domed case, the thick crystal, the crown guard and the dial surface. The criteria below cover what 33665 means, which movement to accept, and the external details that separate a wearable replica from an obvious one.

What 33665 refers to in replica listings

Sellers use 33665 as a stock code for the 33mm Ballon Bleu de Cartier in stainless steel, usually the silver-dial automatic with Roman numerals and a date at 3 o'clock. The genuine watch is a mid-size piece: 33mm case, about 10mm thick, sapphire crystal, and the collection's signature fluted crown set with a blue cabochon and framed by a curved crown guard. Cartier has offered this size on alligator strap and on steel bracelet, so a 33665 listing can be either, and the code alone will not tell you which.

  • Pros: the 33mm is the most reproduced size, so straps, crystals and spare parts are easy to find.
  • Cons: the same code gets reused across factories, so quality varies a lot between sellers.

Use case: buy 33665 if you want a dress watch that slips under a shirt cuff and your wrist measures about 6.75 inches or less.

Movement: quartz, Asian automatic or Swiss

Quartz

The cheapest 33665 builds use a quartz module. The seconds hand ticks instead of sweeping, and the case is often thinner than the genuine automatic.

  • Pros: low cost, no winding, no service needed.
  • Cons: ticking seconds hand is an instant tell on a watch sold as an automatic; case thickness and crown height are often off.

Asian automatic clone

Most mid-tier listings use an Asian clone of the ETA 2824 or a Miyota derivative. Both give a sweeping seconds hand and a date that flips near midnight.

  • Pros: correct hand sweep, reasonable accuracy out of the box, any watchmaker can regulate it.
  • Cons: rotor noise on cheap examples, inconsistent winding, date change can drift.

Swiss movement

A Sellita or ETA-based movement is the top tier. You pay more, so ask for a clear movement photo before buying.

  • Pros: smoother winding, quieter rotor, better long-term serviceability.
  • Cons: highest cost, and some sellers claim Swiss without proof.

Use case: choose quartz only for a gift or a watch worn twice a month; choose the Asian clone for daily wear; pay for Swiss only if you plan to keep the watch and have it serviced.

Case, crystal and dial

The Ballon Bleu case is a rounded cushion with a domed bezel, and the crystal is thick and slightly domed to match. On a replica, look at the crystal edge first: a thin flat crystal with a white halo at the rim is the fastest tell. The steel 33665 dial is silver with a flinqué guilloché pattern of concentric rings that radiate from the center. Replicas often stamp this shallow or print it, so the texture vanishes in low light. Check that the Roman numerals are crisp at the corners, that the minute track is continuous, and that the blued sword hands are blued steel or a convincing coating rather than flat blue paint with brush marks under a loupe.

  • Pros of the better build: correct dial texture, domed sapphire, hands that shift color as the light moves.
  • Cons: costs more, and still cannot match the genuine dial depth under strong light.

Use case: if you wear the watch to an office under fluorescent light, spend on the dial. If it lives under a cuff, the crystal profile matters more than the texture.

Crown and cabochon

The crown is the Ballon Bleu's signature and the hardest part to fake. It should be fluted, set with a domed blue cabochon, and partly shielded by a curved guard that flows out of the case. On replicas the cabochon is often flat, too purple, or glued proud of the crown, and the crown itself can sit too high or wobble when you wind it.

  • Pros: a good crown and cabochon change how the watch reads in photos and on the wrist.
  • Cons: replacement cabochons are hard to source, so a bad one is permanent.

Use case: ask for a side profile photo and a macro of the crown before you pay. If the cabochon is flat or painted, walk away.

Bracelet, strap and clasp

Steel versions should show polished center links and brushed outer links, with a deployant clasp that closes with a firm click. Replica bracelets often have sharp edges on the underside and a clasp that rattles. Strap versions should use leather with a fine alligator grain, even stitching, and a signed buckle or deployant.

  • Pros: a steel bracelet hides case flaws and is easier to size at home.
  • Cons: replica bracelets are the first part to feel cheap, and leather straps wear out within months.

Use case: pick steel for daily wear and easy resizing, leather if you want the dressier look and plan to fit a better strap later.

Caseback, engraving and numbers

The caseback is solid steel and screws down, with engraving around the rim and reference and serial numbers between the lugs. Genuine engraving is deep and crisp under a loupe; replica engraving is usually shallow and laser-etched with rounded edges. Check the caseback fit as well, since a visible gap at the rim means water will get in.

  • Pros: clean engraving is a cheap way to spot a better factory.
  • Cons: numbers on replicas rarely match a real Cartier reference, so never use them to prove anything.

Use case: if you swim or shower with the watch, have a watchmaker pressure test it first. Most replicas are not rated for water.

Matching the version to your wrist

The 33mm case wears small and formal, which suits narrow wrists and cuffs. If your wrist is larger than about 7 inches, the 33mm will look undersized next to a modern 40mm watch, and the 36mm Ballon Bleu is the better proportion even though it sits outside the 33665 code.

  • Pros of 33mm: correct dress-watch proportions, light on the wrist, easy to hide under a sleeve.
  • Cons: looks small on larger wrists and has less presence in casual settings.

Use case: 33mm for office and formal wear on wrists up to 6.75 inches; step up in size if you mostly wear short sleeves.

Checklist before you pay

  1. Ask for macro photos of the dial, the crown in profile and the caseback engraving.
  2. Request a movement photo and confirm the exact movement type in writing.
  3. Ask for the measured case thickness and weight, then compare with the genuine figures.
  4. Confirm the crystal is sapphire and domed, not flat mineral glass.
  5. Ask about the return policy and whether the watch ships with the strap or bracelet shown.
  6. Plan a pressure test and a regulation check with a local watchmaker after delivery.

A fake Ballon Bleu 33665 is worth buying when the crown, crystal and dial texture are right, because those are the parts people see. Movement and engraving decide how long it lasts and how it feels to own.