The short answer
In replica listings, 33694 almost always points to the 36mm Cartier Ballon Bleu de Cartier. Cartier stamps its own reference codes on the caseback, usually a W-number, so 33694 is market shorthand that factories and sellers use for one specific build: mid-size steel case, rounded pebble profile, crown tucked into a guard at 3 o'clock, blue cabochon on top. If a listing shows 33694 next to a 42mm or a 28mm photo, the seller is sloppy. Confirm the diameter in millimeters before you send money.
Why 36mm is the version most people want
The Ballon Bleu reads small for its stated size because the case is domed and the lugs curve down. A 36mm case sits close to a 34mm flat watch on the wrist. That makes it the sweet spot for a lot of buyers: it fits a 6 to 7 inch wrist without overhang, it works on a steel bracelet or a leather strap, and it looks at home on a man or a woman. The 42mm version is a different animal. The 28mm is a jewelry piece with a quartz movement and no center seconds hand.
Case thickness matters as much as diameter. The genuine 36mm automatic runs about 10mm thick, and a replica that measures 12mm or more will sit high and feel wrong under a shirt cuff. Ask for a caliper photo of the case, not just a wrist shot.
Quartz or automatic
Both exist in the 33694 size, and the choice changes what people notice.
- Quartz. No center seconds hand on the 36mm, so there is no ticking giveaway. Cheap, thin, accurate. Battery changes every two to three years.
- Automatic. Sweeping seconds hand, exhibition or solid caseback depending on the build, usually based on a Miyota 9015 or a Chinese ETA 2892 clone. Heavier, thicker, and closer in feel to the real thing.
If you care about how it feels on the wrist, go automatic. If you want a grab-and-go watch that never needs winding, quartz is not a compromise at this size.
Details people actually inspect
The Ballon Bleu has a few signature elements that are hard to fake well, and those are the ones worth zooming into.
- Crown guard. A curved shoulder on the case at 3 o'clock that wraps partway around the crown. On weak replicas the guard looks glued on or sits at the wrong angle.
- Cabochon. A blue synthetic spinel set into the crown. It should be smooth, deep blue, and centered, not a flat plastic dot.
- Dial. Guilloche texture in the center, Roman numerals with the XII and VI shaped like the originals, blued sword hands. Check the numeral printing for bleed under magnification.
- Caseback. Engraving depth, font, and serial spacing. Genuine Ballon Bleus have crisp, shallow laser engraving.
- Bracelet and clasp. The steel bracelet has five rows of polished and brushed links that taper. A butterfly clasp should close flush with no gap.
Before you buy: a quick checklist
- Ask for the case diameter in millimeters with a caliper in the frame.
- Ask for the weight in grams. A 36mm steel automatic lands near 100 to 120 grams; anything near 60 grams is hollow and cheap.
- Request a straight-on dial photo and a macro of the crown.
- Confirm the movement type in writing, quartz or automatic, with the model name.
- Check the return window. A no-return policy on a watch you cannot inspect in person is a bad deal.
Living with it
Keep any replica away from water even if the listing claims 30 or 50 meters. Gaskets on budget watches are not tested. Clean the case and bracelet with a dry microfiber cloth, avoid magnets, and have a watchmaker check the crown seal once a year. Treated well, a solid 33694 build holds up for years and looks the part from across a table.