Is your Tank Must
the real deal?
The Cartier Tank Must is the entry point to one of the most iconic watch families in history. Its accessible price and high desirability make it a frequent target for counterfeiters. With colorful dial options and a SolarBeat variant, authentication requires attention to specific details. Here's how to tell the difference.
How to authenticate a Tank Must
Case Shape Precision
The Tank Must has clean, sharp rectangular lines with perfectly straight vertical brancards (side rails) and crisp 90-degree corners with a subtle radius. The polished steel finishing should be mirror-like and free of machining marks. Counterfeits often have imprecise corners that are too rounded or too sharp, uneven brancards, or visible tool marks on the polished surfaces.
Dial Color Accuracy
The Tank Must is available in distinctive dial colors: deep cherry red, forest green, midnight blue, and classic silver-white. Each color has a very specific shade that Cartier achieves through lacquering techniques. The dial should have depth and richness, with a smooth, even surface. Counterfeits often get the shade wrong — too bright, too dark, or unevenly applied — and lack the subtle lacquer depth of the genuine article.
Roman Numerals & Secret CARTIER Signature
The dial features Roman numeral hour markers printed in Cartier's signature style. At the VII (7 o'clock) position, the word "CARTIER" is hidden as a micro-engraved secret signature within the numeral. Use a loupe to verify — the text should be sharp and cleanly printed. On colored dials, the numerals should contrast cleanly against the lacquered surface with no bleeding or feathering.
Blued Steel Sword Hands
Like all Cartier Tank watches, the Must features sword-shaped (épée) hands made from heat-treated blued steel. The blue color shifts between deep navy and vivid blue depending on the light angle. On counterfeits, the hands are painted blue, producing a flat, lifeless color with no depth or angular shift. Under magnification, genuine blued steel has a smooth, polished surface, while painted hands show coating irregularities.
"Cartier" Signature at 12 O'Clock
The "Cartier" brand name is printed at the 12 o'clock position in Cartier's distinctive font. It should be perfectly centered, horizontally aligned, and printed in a consistent weight. On colored dial models, the text is rendered in a contrasting color (gold-tone on dark dials). Fakes often have slightly off-center text, incorrect font proportions, or text that bleeds into the dial surface.
Case Back Engravings
The case back of a genuine Tank Must features the Cartier logo, reference number, serial number, "WATER RESISTANT" marking, and material designation. All engravings should be crisp and evenly spaced using Cartier's proprietary font. The four case back screws should be perfectly aligned with their slots parallel. Counterfeits often have shallow engravings, misaligned screws, or text in the wrong font.
Tank Must counterfeit warning signs
Wrong Dial Color Shade
The Tank Must's colored dials are achieved through precise lacquering that gives them a deep, rich appearance. Counterfeits frequently miss the exact shade — the red may be too bright or too orange, the green too light or too yellow, and the blue too dark or too purple. Compare the dial color against official Cartier product photography under neutral lighting. An incorrect shade is one of the easiest tells.
Painted Hands Instead of Blued Steel
This is one of the most common counterfeit giveaways across all Cartier models. Genuine Cartier hands are heat-treated blued steel with a deep, reflective blue that changes tone with viewing angle. Painted hands appear flat and uniform regardless of angle. Tilt the watch under a light source — genuine blued steel will show a dramatic color shift from dark navy to vivid blue, while painted hands remain static.
Missing Secret Signature at VII
Every genuine Cartier Tank Must has "CARTIER" micro-printed within the VII Roman numeral. This is a standard Cartier authentication feature that many counterfeiters either omit or execute poorly. Inspect with a 10x loupe — the letters should be crisp, evenly spaced, and proportional to the numeral. If it is missing, smudged, or illegible, the watch is almost certainly fake.
Imprecise Case Corners
The Tank Must's rectangular case requires extremely precise machining to achieve its clean lines. Counterfeits often show corners that are too rounded, asymmetric, or have visible finishing imperfections. The brancards (vertical side rails) should be perfectly parallel and evenly wide from top to bottom. Look at the case straight-on from the front — any waviness or asymmetry indicates a counterfeit.
Scan your Tank Must now
Upload a few photos and get an AI-powered authenticity report in seconds. Your first scan is free.
Start ScanningFor high-value purchases, we recommend pairing your AI scan with an in-person inspection by a certified watchmaker for complete peace of mind.
Frequently asked questions
What is the difference between the Tank Must, Tank Française, and Tank Louis?
The Tank Must is Cartier's current entry-level Tank, featuring a clean rectangular case in steel with leather strap or steel bracelet options and colorful dial variants (red, green, blue, white). The Tank Française has a distinctive chain-link integrated bracelet with a more jewelry-like look. The Tank Louis Cartier is the dressiest version, available only in precious metals (gold or platinum) with a leather strap, and features the most classic, refined proportions. The Must offers the most accessible entry into the Cartier Tank family.
What is the Cartier SolarBeat movement?
The Cartier SolarBeat is a solar-powered quartz movement used in select Tank Must models. It uses photovoltaic cells hidden beneath the dial to convert light into energy, providing up to 16 years of battery life without needing a battery change. The SolarBeat models can be identified by their slightly different dial texture that allows light to pass through. Not all Tank Must models use SolarBeat — standard quartz versions are also available.
What sizes does the Tank Must come in?
The Cartier Tank Must is available in two sizes: small (29.5mm x 22mm) and large (33.7mm x 25.5mm). Both sizes use quartz movements (standard or SolarBeat). The small size is traditionally considered a women's watch, while the large size is unisex. The case is stainless steel with polished finishing, and it pairs with either a leather strap or a steel bracelet depending on the variant.