Cartier Santos-Dumont WSSA0046: specifications and checks

Lacquer does not polish out

Cartier specifies the case as steel with black lacquer.

That single phrase should govern the whole condition assessment, because it removes the usual safety net. A marked steel case goes to a watchmaker and comes back looking close to new. A lacquered case does not — the finish is a surface layer over the steel, and when it wears through, what shows is bare metal in a patch. Buffing it only strips away more of what remains.

So look where surface finishes always fail first:

• Case edges and corners, which meet the world before anything else
• The area around the crown, where fingers and tools land
• The strap attachment points, where a spring bar tool slips
• The case back perimeter, if it has been opened

Anything you find is permanent for the life of the watch. Photograph it, describe it, and take the deduction at the buy. A buyer who receives a lacquered watch with an undisclosed bright patch reads it as concealment, because from where they stand that is what it looks like.

The dial carries the same warning in a different form: Cartier describes it as black square decoration with translucent lacquer. Damp and fingerprints register on a translucent lacquered surface in a way flat paint conceals, and nothing can be put back afterwards. Examine it across the whole face, at several angles.

A signed case back

Cartier engraves the case back with the handwritten signature of Alberto Santos-Dumont.

That is part of what the reference is, not a flourish. Photograph it straight on and in focus at the buy, and check the engraving is crisp rather than soft. A case back that has been polished — and on a lacquered watch, that should not have happened at all — leaves the signature shallow, which is both a condition issue and a question about what else was done.

Hand-wound, no reserve stated

Cartier gives the movement as the calibre 430 MC, wound by hand, and built in-house. No reserve figure accompanies it, so none belongs in your listing.

The 430 is a thin movement and this is a thin watch — 7.3 mm over a case measuring 43.5 mm x 31.4 mm. Quote both case figures; there is no diameter here, and the length is what a buyer will notice most, since it runs a long way down the wrist.

Wind it from stopped, feel the tension build evenly, and stop when it stops. Nothing protects the mainspring from an owner used to automatics, and this is a watch that will often be somebody's first hand-wound piece. Say so at handover.

Thirty metres, and a strap

Water resistance is 3 bar (approx. 30 meters/100 feet), on a black alligator leather strap with a steel ardillon buckle.

Rain and hand washing. The combination of a lacquered case and a leather strap makes that a real constraint rather than a technicality — moisture is a problem for both.

The crown is beaded steel, set with a blue synthetic spinel cabochon: a set stone in a part handled daily on a hand-wound watch. Check it for chips and confirm it is firmly seated.