Cartier Ballon Bleu WSBB0044: specifications and what to check

A diameter, for once — and a thickness that matters more

Most of the Cartier references documented here are rectangular and have no diameter to state. This one is round: 33 mm, at 10.16 mm thick.

Lead with the second number.

Ten point one six millimetres on a thirty-three millimetre case is tall relative to its width. It is thicker than the Santos references here, which are wider and flatter, and considerably thicker than any of the Tanks. That proportion — a small, domed, fairly deep case — is what a Ballon Bleu actually feels like, and it is the thing a buyer working from diameter alone will not expect.

Quote both, and say which is which.

The crown guard is the design and the vulnerability

The Ballon Bleu's recognisable feature is the arc of case metal that sweeps over and around the fluted crown set with a cabochon synthetic spinel.

It is also the part that takes the knock. The guard stands proud on the side of the case at the widest point, so a door frame or a desk edge meets it first, and because it is a curved continuation of the case it cannot be straightened or replaced the way a separate component could.

Inspect it under raking light from several angles, looking for flattening on the outer curve and for any distortion where the guard meets the case band. Then work the crown itself: it should pull and push cleanly, and the stone should be chip-free and firmly set.

Any damage there is central to how the watch looks, not peripheral.

Guilloche hides nothing

The dial is specified as silver guilloche — a machined pattern rather than a flat or brushed surface.

Patterned dials are unforgiving in exactly the way textured dials are elsewhere in this corpus. Moisture marking, a fingerprint pressed in during a careless service, uneven ageing — all of it shows against a regular machined pattern in a way it never would on a plain surface, and none of it can be retouched.

Examine the whole face at several angles under a good light, and pay particular attention to where the pattern meets the applied elements and the perimeter.

While you are there, give the blued-steel sword-shaped hands a loupe. Blued steel records heat and handling permanently.

What Cartier does not state

For this reference Cartier publishes no calibre number, no power reserve, no lug width and no accuracy figure. The movement specification is, in full: mechanical movement with automatic winding.

Write that and stop. A calibre number carried over from another Cartier is a claim the maker has not made about this watch.

The bracelet is described as steel interchangeable — which answers the practical question without giving a strap width. Release it and refit it once to prove the fitting still works.

Cartier rates it at 3 bar (approx. 30 meters/100 feet). Write that out as a sentence in the listing rather than leaving a bare figure in a table — thirty metres is a good deal less than most buyers assume.