Short answer
Cartier does not publish a reference 2370. The number appears in resale listings for steel and vermeil Tanks built from the 1970s through the 1990s. A fake shows itself in four places: caseback markings, crown cabochon, dial print, and movement. Check those four items before money changes hands.
What the number 2370 means
Cartier stamps a case reference on the caseback. Tank references run to four or five digits, and the brand has never kept a public database of them. Sellers attach 2370 to steel Tanks, to Must de Cartier vermeil Tanks, and to quartz models with no paperwork. The number alone proves nothing. Ask for a photo of the caseback and a photo of the movement before you bid.
Verification runs through a Cartier boutique or an independent watchmaker. Cartier charges for a service estimate. That estimate names the case metal, the caliber, and the production period.
Caseback and hallmarks
Must de Cartier Tanks use a sterling silver case with gold plating. The caseback carries "Argent 925" and a plating figure, most often 20 microns. Gold Tanks carry "750" or "18K" plus a French assay mark, the eagle head.
- Genuine engraving sits deep in the metal with clean edges.
- Fake engraving looks shallow and bright, cut by laser.
- Serial numbers on fakes repeat across batches.
- Plating thickness is the marking most fakes leave out.
Crown and cabochon
The genuine crown holds a blue cabochon, a faceted spinel on steel and vermeil models, a sapphire on solid gold. The stone sits flush in a gold or steel collet. Replica crowns use plastic or glass. The stone sits flat, the color drifts toward purple, and glue shows at the rim.
Dial
"Cartier" prints in Roman capitals below 12. "Swiss Made" prints at 6 in letters under one millimeter. Several Tanks hide a secret signature inside the VII or the X numeral.
- Numeral proportions: the fake X is wider and the VII strokes are uneven.
- Print quality: genuine dial text has sharp serifs.
- Position: a "Swiss Made" line shifted off center signals a redial or a fake.
- Finish: matte on vintage models, not glossy.
Case size and movement
Must de Cartier Tanks measure about 23 mm by 30 mm and run 6 mm thick. Tank Louis Cartier models measure about 22.5 mm by 30 mm and use a hand wound caliber. Quartz Must models use a Cartier signed movement built on an ETA base. Open the caseback or ask the seller for a photo of the rotor or the quartz module. A blank movement with no Cartier stamp ends the deal.
Price and paperwork
Working vermeil Tanks sell from about $1,500 to $4,000 at auction. Solid gold Tanks sell higher. A listing at $200 is not a genuine watch. Ask for the guarantee card, the box, and any service receipt. Paperwork raises value but does not replace a look at the caseback.
Before you pay
- Request caseback, crown, dial and movement photos.
- Match the case reference against the caliber.
- Weigh the watch. Vermeil Tanks sit near 30 to 40 grams.
- Pay with a method that allows a return.
Replica sellers label their own product as a replica. The risk sits in listings that present a replica as a genuine watch. No replica matches a genuine Tank at 10x magnification.