The pick that fits most people searching for the Ballon Bleu 33663 is a 33mm automatic, because it comes closest to the proportions and feel of the watch the code points to. The criteria that decide whether you get something worth wearing are case diameter and profile, movement type, dial printing and finish, the crown cabochon, and how the bracelet or strap is built. This guide assumes you already know these are replica listings and want to judge them on their own terms.
What the code 33663 actually is
Cartier's own catalog uses alphanumeric references that begin with W, such as W69012Z4 or W6920071, and some retail systems display them with a CR prefix. A bare five digit number like 33663 is a seller side code. It appears in replica listings to group one case size, dial color and movement combination together. Treat it as a listing category, not as a Cartier model number, and read the spec sheet on the page rather than trusting the number in the title.
In practice, listings that use 33663 describe a Ballon Bleu style watch with a round case, a guilloche or flinque dial, Roman numerals, blued steel style hands, and a blue cabochon set into the crown guard. Most of them come in 33mm and 36mm, with 42mm versions usually listed under a different code.
The five things that decide quality
- Case diameter and thickness. 33mm reads as a dress watch, 42mm reads as a sporty unisex piece. An extra millimeter of thickness changes how it sits under a cuff more than the diameter does.
- Movement. Automatic movements sweep. Quartz ticks once per second. That single detail is the fastest way to confirm what is inside the case.
- Dial printing. At this scale, look at numeral spacing and how clean the brand text and the country of origin line are.
- Cabochon. A sapphire cabochon has depth and a slight color shift as the light moves. Resin or glass looks flat outdoors.
- Bracelet or strap. Solid links that articulate without rattle, and a butterfly clasp that closes flush, separate the better builds from the rest.
Option 1: 33mm automatic
This is the version most buyers should look at first. The size matches the classic Ballon Bleu proportions, and an automatic movement gives the smooth seconds hand that people associate with a mechanical watch.
- Pros: correct proportions for small and medium wrists, sweeping seconds hand, dress watch look that works with formal clothing
- Cons: higher cost than quartz versions, thicker case than the original, service options are limited to third party repair shops
Use case: an everyday office or dress watch for someone who wants the profile more than the branding.
Option 2: 33mm quartz
The cheapest way into this look. The case and dial are usually the same as the automatic version, and the difference lives entirely in the movement.
- Pros: lowest price, thin case, accurate timekeeping, no winding or setting ritual
- Cons: ticking seconds hand that reads as quartz from across a room, no mechanical feel, battery changes require opening the case back
Use case: a gift or a second watch where cost matters more than the movement.
Option 3: 42mm automatic
The largest version of the same design. It puts more metal on the wrist and reads as a statement piece rather than a subtle one.
- Pros: strong presence on a larger wrist, more visible dial detail, often the best finished case in a given seller's lineup
- Cons: oversized on wrists under about 6.5 inches, heavier on a bracelet, harder to wear under a tight shirt cuff
Use case: a larger wrist or someone who wants the watch to be noticed.
Checks to run before you pay
- Confirm the movement type in writing, not from the photos.
- Ask for a photo of the crown cabochon in daylight, since that is where cheaper builds show first.
- Check listed water resistance, and assume it is optimistic. Do not swim in it.
- Read the return policy, including who pays shipping on a return.
- Look at customer photos rather than seller photos. The gap between the two is where disappointment lives.
Risks and the US legal picture
A replica is not a Cartier watch and will never be serviced by Cartier. There is no manufacturer warranty, plating on budget cases wears through at the edges and clasp, and resale value is close to zero. On the legal side, counterfeit trademarked goods can be seized at import by U.S. Customs and Border Protection, and brand owners can bring civil claims under the Lanham Act against sellers and against buyers who resell. Buying within the United States lowers the seizure risk but does not remove the trademark issue. Budget for the possibility that the watch is never delivered, and treat any purchase as a disposable cost rather than an investment.