Short answer

A fake Cartier Tank Must 28mm gives itself away in five places: the case width, the dial printing, the crown cabochon, the caseback engraving, and the seconds hand. Check those five before anything else. Each one takes under a minute with a caliper and a 10x loupe, and two or more failures mean the watch is not genuine.

Cartier Tank Must 28mm Fake: A Comprehensive Guide

Prerequisites

  • Digital caliper with 0.1 mm resolution
  • 10x jeweler's loupe
  • Bright, diffuse light and a clean background
  • Cartier's published specs for the reference number the seller claims
  • A macro photo of a genuine example of the same reference for side by side comparison

1. Measure the case first

Sellers put a width in the title and hope nobody checks it. Case width is the number one tell on a small Tank, because counterfeiters fit one generic case to several references.

How to Choose the Best 28mm Replica Watches

  1. Place the caliper jaws across the case at 3 and 9 o'clock, on the widest point of the case middle.
  2. Record the reading to 0.1 mm.
  3. Measure lug to lug at 12 and 6 o'clock.
  4. Lay the watch dial up on a flat table and measure from the table to the top of the crystal.
  5. Compare all three numbers with Cartier's published figures for the claimed reference.
  6. Note the lug width and confirm the case takes the strap size Cartier specifies.

A case width in the high 20s sits between several Tank case sizes, and listings blur them on purpose. If the seller cannot name a reference number that matches the measured case, stop there.

2. Read the dial under the loupe

Cartier dial printing is thin, sharp, and consistent. Counterfeit dials use pad printing with heavier ink and rounded edges.

  1. Check that the 4 o'clock numeral is IIII, not IV, on Roman numeral dials.
  2. Look for the secret signature inside one of the Roman numerals. Genuine dials hide the word CARTIER in the numeral. Counterfeit dials print the numeral solid or leave a smear.
  3. Inspect the CARTIER signature under the 12. Stroke width should be even, with no ink bridging the gaps in the letters.
  4. Confirm SWISS MADE sits centered under the 6 and carries the same weight as the rest of the dial text.
  5. Check for a date window. If the claimed reference has no date, a window at 3 o'clock is a red flag.
  6. On lacquered color dials, confirm the dial is plain. Cartier does not print Roman numerals on the colored Tank Must dials.

3. Inspect the crown and cabochon

The cabochon is the fastest visual check you can run on the wrist.

  1. Confirm the cabochon is blue and set into a fluted crown.
  2. Look at the dome. A plastic or glass cabochon has a dull surface and visible mold lines. The genuine stone has a smooth polish with no seam.
  3. Count the flutes on the crown and compare count and depth with a macro photo of a genuine example.
  4. Check the crown sits square against the case with an even gap all around. Counterfeit crowns sit crooked or stand proud.
  5. Turn the crown. A quartz Tank clicks into each position with no grinding.

4. Read the caseback codes

  1. Check the screws. The Tank Must caseback is held by screws in the corners. Look for clean countersinks and matching slot width on all four heads.
  2. Read the reference number and the serial number under magnification.
  3. Compare engraving depth. Genuine engraving is cut into the metal. Counterfeit codes are laser etched and sit on the surface.
  4. Search the serial number. Counterfeit batches reuse one serial across hundreds of watches, so a repeated serial is proof of a fake.
  5. Match the caseback serial to the warranty card and the box label. All three should agree.

5. Watch the seconds hand

The quartz Tank Must ticks. If the seconds hand glides, the watch holds a mechanical movement that does not belong in that case.

  1. Watch the seconds hand for 30 seconds and count the ticks. A quartz movement steps once per second.
  2. Pull the crown to the setting position and check that the seconds hand stops.
  3. Line the seconds hand up with the minute track and check it lands on the markers. Loose alignment points to a cheap movement dropped into the case.
  4. Tilt the watch and listen for rotor noise. A quartz Tank has no rotor, so a rattling weight inside is wrong.

6. Check the strap, buckle, and bracelet

  1. Check the leather. Genuine Cartier straps have tight, even stitching with no stray threads.
  2. Look at the buckle engraving under the loupe. Genuine engraving is crisp and deep. Counterfeit logos look shallow and fuzzy.
  3. Flex the buckle. Thin stamped metal bends under light finger pressure.
  4. On bracelet versions, check link fit. Links should move with no side play, and the clasp should close with a solid click.
  5. Check the spring bars. Genuine quick release bars sit flush in the lug holes.

7. Verify the paperwork and the price

  1. Ask for the reference number, the serial number, and the original invoice.
  2. Confirm the warranty card carries the correct reference and serial in the factory print, not handwritten in a different font.
  3. Compare the asking price with current retail for the same reference on cartier.com. A steel quartz Tank Must does not sell for a few hundred dollars.
  4. Ask for a photo of the watch on a scale. Weight is harder to fake than a listing photo.

If the seller refuses any of these steps, treat the watch as counterfeit and walk away.

Where the fakes get closest

Cosmetic copies of the small Tank have improved. Case shape, dial layout, and crown position can look right in a phone photo. The tells that survive are dimensional and mechanical: a case that measures off by a millimeter, engraving that sits on the surface instead of in it, a reused serial number, and a seconds hand that behaves like the wrong movement. Buy the measurements, not the listing.