Quick answer

A fake Cartier Tank Must 2021 is a replica of the steel Tank Must that Cartier launched in 2021 to replace the Tank Solo. Almost all of them run a generic quartz movement inside a case that copies the real proportions: 33.7 by 25.5 mm for the large model, 29.5 by 22 mm for the small. The copies get the silhouette right and the details wrong. The crown cabochon, the dial printing, the hands, and the case back engraving are where a fake shows itself.

What you need before you inspect

  • A 10x jeweler loupe
  • Digital calipers
  • A phone with macro mode or a close focus lens
  • Reference photos of the large and small Tank Must from the Cartier catalog

The real Tank Must 2021 in short

Cartier built the Tank Must around a steel case with a solid steel back, a sapphire crystal, and a silvered opaline dial with Roman numerals and a chemin de fer minute track. The crown carries a synthetic blue spinel cabochon, not a sapphire. Buyers could choose a high autonomy quartz movement with a battery rated at roughly eight years, or the SolarBeat photovoltaic movement, which needs no battery change. Steel models on leather shipped with a calf or alligator strap and a steel ardillon buckle. Reference numbers stamped on the case back start with WSTA.

Tells on a fake Cartier Tank Must 2021

  • Crown cabochon. The real stone is a domed synthetic spinel in a deep even blue, set flush in the crown. Fakes use flat glass or plastic that reads purple or milky under light.
  • Dial finish. The silvered opaline dial has a fine matte grain. Copies are glossier or chalky, and the chemin de fer track drifts out of alignment near the numerals.
  • Printing. The Cartier wordmark and the Roman numerals should be crisp and consistent in stroke weight. Fakes show fuzz at the edges, thick VII strokes, or "Swiss Made" sitting too low or too close to the track.
  • Hands. Real sword hands are blued steel with a bright polished bevel. Replicas paint the blue over flat metal, so the color looks chalky and the bevel disappears.
  • Hidden signature. On many Tank dials Cartier works the word CARTIER into the VII numeral. Look at the strokes and see whether they actually form letters.
  • Case back. Genuine engraving is deep and sharp with one serial number. Fakes use shallow laser etching, repeat the same serial across units, or pair a reference that does not match the dial and movement.
  • Strap and buckle. The keeper, stitching, and buckle tang are where cheap replicas cut corners. Look for uneven stitching and a buckle with soft edges and no maker stamp.

How to inspect one, step by step

  1. Place the watch on a flat surface under neutral light and study the dial from 30 cm away.
  2. Measure the case across the bezel with calipers and compare the reading to the size listed on the reference card.
  3. Examine the crown cabochon with the loupe and check its dome, color, and fit.
  4. Tilt the watch toward a window and watch how the hands catch light along their bevels.
  5. Turn the watch over and read the case back engraving line by line.
  6. Flex the strap and inspect the stitching, the keeper, and the buckle stamp.
  7. Compare the reference and serial on the back against any paperwork, box, or service record.
  8. Wind or set the watch and time how the seconds hand sweeps or ticks.

Replica grades and what they get right

Budget copies sell under 100 US dollars and skip the cabochon shape, the sapphire crystal, and the case back detail. Mid tier replicas in the 200 to 400 dollar range copy the case profile well and often fool a casual glance, but the printing and the hands still give them away. The most costly replicas chase the correct thickness, a genuine looking cabochon, and a decorated quartz movement, and they still miss the engraving depth and the dial grain.

Questions to ask before money changes hands

  1. Ask for a macro photo of the crown, the dial center, and the full case back.
  2. Ask for the reference number and a photo of the same number on the back.
  3. Ask whether the crystal is sapphire and whether the cabochon is stone or glass.
  4. Ask about the return window in writing before you pay.