Answer first
"33680" is not a Cartier reference number. It is a seller code, usually a mashup of a case size, a batch number, or a factory tag, and it shows up on replica listings far more than on genuine paperwork. Cartier's own catalog uses four-digit references like 3001 or 3284 plus a full model number starting with W. So treat 33680 as a label for a listing, not a spec sheet. The watch behind it is almost always a mid-size Ballon Bleu style automatic, 36mm or 42mm, and your job is to confirm what you are actually getting by measurement and inspection rather than by the number in the title.
Read the number, then set it aside
I see the same pattern in listings for this model. The code carries information about the seller's batch, not about the watch. When a listing says 33680 and then quotes 36mm, a blue spinel cabochon, and a Swiss automatic, those three claims are what you check. If the seller cannot tell you the case diameter with a caliper reading or point to the movement inside, the code means nothing.
A quick sanity list for the listing text:
- Case diameter and thickness, stated in numbers, not "men's size"
- Movement family named, for example an ETA clone, a Miyota, or a Chinese automatic
- Crystal type, sapphire or mineral
- Strap or bracelet material, plus clasp type
- Real photos of the actual watch, not catalog renders
The four checks that matter most
1. Crown and cabochon
The Ballon Bleu lives or dies on the crown. Genuine watches use a fluted crown capped with a blue synthetic spinel cabochon, tucked under a curved crown guard that flows out of the case. On replicas this is where corners get cut. Look for a cabochon that sits flush and reads deep blue rather than flat royal blue plastic. The fluting should be crisp and even. If the crown looks glued on or the guard has a visible seam, walk.
2. Dial texture and printing
The dial should have a fine guilloché texture in the center that shifts under light, with Roman numerals that are printed or applied cleanly and evenly spaced. On cheaper fakes the texture is a flat stamped pattern that reads like a sticker. Zoom in on the numerals. Blurry edges, uneven thickness, or a date window that sits off-center are the usual tells. Also check the small hidden signature inside the VII numeral, which better replicas attempt and cheap ones skip.
3. Case profile and caseback
A Ballon Bleu case is a rounded pebble shape with a domed sapphire crystal, not a flat disc with beveled edges. Side photos help here. The caseback engraving should be sharp and deep enough to catch a fingernail; laser-etched fakes look shallow and smudged. Check that the caseback screws line up and that the reference text is legible under a loupe.
4. Movement and feel
Ask directly what powers it. A Swiss or Japanese automatic in a replica of this type will sweep smoothly and hack. A cheap quartz will tick once per second, which is an instant disqualifier for a watch marketed as an automatic. Weight is a rough guide: a 36mm stainless case with a real automatic should feel solid in the hand, not hollow. Wind it slowly and listen for grit.
Photos that hide problems
Bright studio shots flatten dial texture and hide case scratches. Ask for a short video in daylight, plus a straight-on dial shot and a profile shot. Video also shows whether the second hand sweeps or ticks, which settles the movement question faster than any description.
Price sanity check
If the price is far below what other sellers ask for the same spec, the movement or the crystal is where the saving came from. Compare a few listings with the same stated specs, then ask yourself what got downgraded to reach that number.
Questions worth sending before you pay
- What is the exact case diameter and thickness?
- Which movement is inside, and does it hack?
- Is the crystal sapphire, and is it domed?
- Can you send a daylight video showing the sweep and the dial texture?
- What is the return policy if the watch does not match the listing?
Get answers in writing. A seller who dodges the movement question is telling you something.