How to Check an Original Cartier Tank (Solo, Must, Française and Vintage)
How to check an original Cartier Tank: secret signature, cabochon crown, caseback numbers and fake tells for the Tank Solo, Must, Française and vintage.
How to check an original Cartier Tank: secret signature, cabochon crown, caseback numbers and fake tells for the Tank Solo, Must, Française and vintage.
A short history of the Tank
Louis Cartier designed the Tank in 1917, and Cartier began producing it in small numbers in 1919. Its shape, two strong vertical sides (called brancards) framing a rectangular dial, has barely changed in over a century. That is why the Tank is one of the most recognised watches in the world, and also why it is widely copied.
This guide covers Tank-specific checks. For the basics that apply to any luxury watch, read our general fake-spotting checklist.
The main Tank models you’ll meet in Pakistan
Tank Louis Cartier
The classic dress Tank from the 1920s, usually in gold. Current versions such as the large-model WGTA0011 use Cartier’s hand-wound calibre 1917 MC, with a 33.7 x 25.5 mm case and a sapphire cabochon on the crown.
Tank Solo
Introduced in the mid-2000s as a simpler, mostly steel Tank. Many are quartz, but there are automatic versions too: the Tank Solo XL W5200027, for example, is a steel automatic using Cartier calibre 049 (based on the ETA 2892-A2).
Tank Must (2021)
In 2021 Cartier relaunched the Tank Must in three sizes: small (29.5 x 22 mm), large (33.7 x 25.5 mm) and extra-large (41 x 31 mm). The small and large models are quartz or SolarBeat. The extra-large is automatic, with calibre 1847 MC. SolarBeat is Cartier’s solar-powered quartz movement: light reaches photovoltaic cells under the dial through perforated Roman numerals. Cartier quotes a lifetime of about 16 years for SolarBeat, against a stated 8 years’ autonomy for the standard quartz. Current Tank Must models have a steel case, a beaded crown set with a synthetic spinel cabochon, and 3 bar (about 30 m) water resistance.
Tank Française
Added in 1996, with a case that flows into an integrated bracelet. Check the reference to know whether a Française is quartz or automatic.
Tank Américaine
Introduced in the late 1980s, an elongated, curved Tank. As with the Française, check the reference to know which movement it should have.
Vintage Must de Cartier
Cartier launched the Must de Cartier line in 1977. Many vintage Must Tanks are vermeil: gold-plated sterling silver, often marked “925” or “Argent” on the case. They are genuine Cartier watches, but the case is gold-plated silver, not solid gold. Many are quartz, though some sellers describe manual-wind examples. Ask which movement is inside.
How to check an original Cartier Tank: 8 checks
1. Find the secret signature
Many Cartier dials hide a tiny “Cartier” signature inside one of the Roman numerals, usually the VII and on some models the X. Auction houses such as Christie’s describe it as a “secret signature at VII”. You need a loupe to read it. It should be sharp and properly placed. Some older pieces from the late 1970s and early 1980s may not have one, so its absence on a vintage watch is not proof of a fake on its own, but a blurry or misplaced signature is a warning.
2. Look at the cabochon crown
Most Tanks have a domed stone on the crown. Gold models such as the Tank Louis Cartier use a sapphire cabochon, while steel Tank Must models use a synthetic spinel. A genuine stone is deep, evenly coloured, smooth and neatly set. Pale, cloudy or purplish glass, plastic that scratches, or a stone with glue around it are fake tells.
3. Check the railway minute track and hands
The inner minute track is a fine “railway” ring with evenly spaced marks. The blued sword hands taper to a fine point, and the minute hand should reach the track. Coarse, uneven printing or stubby hands that stop short are common on fakes.
4. Read the caseback
A genuine caseback has deep, crisp, evenly spaced engraving: “Cartier”, a four-digit case number, a serial number, the metal and “Swiss Made”. Precious-metal cases also carry fineness marks. Shallow, blurry or misspelled engraving is a red flag.
5. Understand Cartier reference numbers
This is where many buyers get confused. The catalogue reference, such as W5200027 or WSTA0041 (sometimes written CRWSTA0041), is not engraved on the caseback. It appears on the warranty card. The four-digit number on the caseback is a case code that identifies the model, size and complication. Since about 2010, Cartier serial numbers follow a 123456AB format; before that, the A12345 style was common. So a caseback showing a “W” reference is suspicious, and the case code and serial must match the card.
6. Match the movement to the model
A quartz Tank Must or Tank Solo ticks once a second, which is normal. A Tank Louis Cartier with calibre 1917 MC is hand-wound, and automatics like the Tank Solo XL or Tank Must XL have a rotor. If a watch sold as mechanical ticks like a quartz, or the movement doesn’t suit the reference, walk away.
7. Check the case and brancards
The brancards should be even in width and meet the strap cleanly with no gaps or steps. Tool marks, uneven edges or a case shape that looks “off” next to official photos are warning signs.
8. Treat papers as one piece of evidence
A warranty card with the right reference and a matching serial adds confidence, but cards and boxes are copied too. Make sure everything matches the watch itself.
Cartier serial number: what it can and can’t tell you
The serial on the caseback is unique to the watch, and Cartier can check it against its own records. It is not a public dating tool, so use it to confirm that the watch and papers belong together, not as proof on its own.
Cartier Tank watch price in Pakistan: what affects it
We don’t quote prices in our guides. The main factors are the model and size, gold, steel or vermeil, quartz or mechanical, condition (especially polishing on the brancards), original crown and strap or bracelet, and whether box and papers are included. A Tank priced far below similar watches usually has a reason.
Frequently asked questions
What is the difference between the Tank Solo and the Tank Must?
Both are simpler, mostly steel Tanks. The Tank Solo dates from the mid-2000s. The Tank Must was relaunched in 2021 in three sizes, with quartz, solar-powered SolarBeat and automatic options. Check the reference on the warranty card to know exactly which model you have.
Is a Must de Cartier Tank real gold?
Vintage Must de Cartier Tanks are usually vermeil: sterling silver plated with gold. They are genuine Cartier, but not solid gold.
Where is the secret signature on a Cartier Tank?
Usually inside the VII numeral, sometimes the X. You need a loupe to see it.
Why doesn’t my caseback show the W reference number?
Because Cartier doesn’t engrave the catalogue reference on the caseback. The caseback shows a four-digit case code and the serial. The full reference is on the warranty card.
Do you buy Cartier watches?
Yes. We buy and trade in watches, including Cartier. Send the details through our sell your watch page.
See our Cartier watches
Browse our Cartier collection, along with our pre-owned and vintage watches. Every watch is inspected by our team before listing, and you can ask for a live WhatsApp video of the exact watch before it ships (+92 310 3017664). Delivery is free nationwide, and cash on delivery is available with a 10% advance on orders up to PKR 100,000. Or visit us at Shop #7, Basement, Haseen Shopping Mall, Latifabad Unit 7, Hyderabad 71000 (Mon–Thu and Sat 1:30–8 pm, Fri 3–7 pm, closed Sunday).
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