The Cartier Tank reference 830107 is a vintage case number tied to 1980s Tank production, and the fastest way to spot a fake is to inspect the caseback first: genuine 830107 stamps are cut into the metal with crisp, evenly spaced letters beside a matching serial number and a French silver hallmark, while replicas show shallow laser etching, wrong fonts, and serial numbers that do not match Cartier service records. The sections below break that check down part by part.

What is the Cartier Tank 830107?

The 830107 reference belongs to the era when the Must de Cartier line turned the Tank into an entry luxury watch. Cases from this period were often vermeil, meaning sterling silver with heavy gold plating, in small and large sizes with lacquer or guilloche dials.

A reference number is not a serial number. The 830107 code identifies the case model, while the serial number is unique to one individual watch and stays with it through servicing.

How do you tell a fake Cartier Tank 830107 from a real one?

Caseback engravings and serials

Authentic Cartier engraving is cut into the metal, so the edges catch light and the characters have visible depth. Fakes use laser etching or stamping that leaves rounded, blurry lettering and house fonts that do not match Cartier style.

The 830107 stamp should sit next to a serial number that is consistent with a genuine production run. If the numbers are misaligned, re-stamped, or the font changes halfway across the caseback, treat the watch as suspect.

Dial printing and the secret signature

On a genuine Tank, the printed Cartier signature is sharp and correctly proportioned, and the Swiss Made line sits at the bottom edge below the 6 position. Replicas often use thicker serif fonts, uneven spacing, or a Roman numeral that reads as a solid printed stroke.

Check the numeral at 7 o'clock with a loupe. On many vintage Tanks the word Cartier is hidden inside the VII, and fakes rarely reproduce that micro-printing cleanly.

Movement, crown, and crystal

Vintage 830107 Tanks typically run a Cartier-signed quartz or manual movement, and the crown carries a blue or sapphire cabochon set into a fluted or plain winding crown. Fakes tend to use unbranded Miyota or Chinese quartz calibers, and the cabochon is plastic or glass that looks flat and feels light.

Mineral glass with a visible edge is not proof either way, since genuine examples from this period also used mineral glass. Open the caseback and identify the movement before you judge the crystal.

Weight, plating, and hallmarks

Vermeil cases carry a French hallmark for sterling silver on the inner caseback or between the lugs. A fake made of base metal with gold paint feels light, warms quickly against the wrist, and shows plating wear at the lugs and crown.

Weigh the watch. A genuine vermeil Tank is noticeably heavier than a brass replica of the same dimensions.

Why are fake Cartier Tank 830107 watches so common?

Cartier produced the Tank in large numbers through the 1980s, so cases, dials, and movements circulate widely and frankenwatches are easy to assemble. The reference number is quoted across forums and marketplaces, so counterfeiters print it on generic Tank-shaped cases.

Because the design is simple, a fake can look convincing in photos and only falls apart under a loupe or on a scale.

How do modern replica Cartier Tank watches compare?

High-tier replica makers now machine cases to the same 23mm by 30mm dimensions and fit sapphire crystal, closer dial printing, and Swiss quartz movements. Those watches remain replicas, they carry no Cartier warranty and no service history, and they cannot be sold as genuine.

Buyers who want the Tank look without vintage-watch risk should know exactly what they are buying before paying.

FAQ

Is a Cartier Tank 830107 always vermeil?

No. The reference appears on both vermeil and solid gold Tanks, so confirm the metal with hallmarks and a weight check. If plating is the only metal evidence, treat the watch as suspect.

How much is a genuine Cartier Tank 830107 worth?

Authenticated examples generally sell in the low four figures, with solid gold versions well above vermeil. Condition, box, papers, and a Cartier service record all move the price.

Can a jeweler tell a fake Cartier Tank 830107?

Yes. A watchmaker can open the caseback, identify the movement, verify hallmarks, and measure the case against known 830107 specifications. That inspection is the only reliable answer.