The small Ballon Bleu with diamonds, second unit. Cheaper, no card.

Cartier is the house that made the wristwatch a shape rather than a circle: the Tank of 1917, the Tortue of 1912, the Tonneau of 1906, each a case with Roman numerals, blued sword hands and a cabochon in the crown. Cartier makes them in gold and in steel, in quartz and in mechanical, and on the pre-owned market the gold ones sit where a Rolex Datejust does in price and a step above it in how they read across a table.

Rebag has two of this model on Amazon. The first, on this site already, came with a dated warranty card and cost more when read; this one has no accessories and cost less. Same 28mm steel case, same row of diamonds in the bezel, same quartz movement. If the card matters to you, the first unit is the one; if the price does, this is. Either way the rows do not mention the diamonds, so ask Rebag to confirm they are factory-set, which on a Cartier means the reference on the caseback ends in the diamond-bezel variant.

Rebag gives the size as 28mm, the thickness as 10mm, the band width as 14mm, the wrist size as 6.0 inches, steel for case and band, quartz, no accessories, and Very Good with minor scratches. The diamond bezel, guilloche dial and cabochon are from the photograph only; the copy says to confirm the stones. No reference is stated; W4BB0015 is the catalogue match, marked confirm. Water resistance is Cartier’s figure for the model.

Rebag authenticates in-house and is not a Cartier authorised dealer, and Amazon adds its 30-day return window. Ask for the reference and the numbers on the caseback, close-up photographs of the wear, and when it was last serviced. Nothing here was measured on the watch.

This unit is sold by Rebag through Amazon Luxury Stores, authenticated by the seller with Amazon’s 30-day return window on top; it is one piece, and when it sells the listing goes away, so the second button opens the live search for Ballon Bleus.

Steel Cartiers have resold close to what pre-owned buyers paid, sometimes more, sometimes less; that is a pattern, not a promise, and nothing here is investment advice.