Short answer
A fake Cartier Tank Must with a white dial is judged on four items: case proportions, dial printing, movement type, and clasp or strap hardware. Get those four right and the watch reads correctly on the wrist. Miss one and the flaw shows at arm's length.
Prerequisites
- Calipers or a ruler marked in millimeters.
- A 10x loupe.
- Reference photos for the size you want: Small 29.5 x 22 mm, Large 33.7 x 25.5 mm, or XL 41 x 31 mm.
- The current product listing for the exact reference number you are comparing.
Steps
- Measure the case width and length with calipers and compare the numbers to the published size. The Tank Must case is a rectangle with softly curved sides, so being 1 mm long or half a millimeter wide throws off how it sits between the lugs and on the wrist.
- Measure the case thickness. The Large steel Tank Must runs roughly 6.6 mm thick. A slab-sided copy is the single most common error in this line.
- Inspect the dial printing under the loupe. "CARTIER" sits in roman capitals under 12, "SWISS MADE" sits at 6, and the minute track should be a crisp, unbroken ring. Look for ink bleed, smashed serifs, or a logo that drifts off center.
- Hunt for the secret signature. Many Tank Must dials hide a small "Cartier" inside the numeral at 7 o'clock. Under magnification the strokes should be sharp, not a filled blob.
- Examine the crown. It carries a faceted blue spinel cabochon set into steel, and it should be evenly colored, smooth, and aligned with the case band rather than glued off-center.
- Confirm the movement behavior. Most Tank Must references are quartz, so the seconds hand jumps once per second. A hand that sweeps smoothly means a mechanical movement fitted to a quartz reference, which is a mismatch.
- Turn the watch over and read the caseback. Reference number, serial, "Swiss Made," and water resistance markings should be laser-crisp and evenly aligned. Shallow stamped engraving points to a low tier build.
- Work the strap or bracelet. A steel bracelet should articulate without rattle, meet the case flush, and carry an engraved logo on the clasp. Leather versions need a signed folding clasp or a quick-release spring bar.
Red flags
- Case thickness well above the published figure.
- Printed logo that crowds or fills the numeral at 7 o'clock.
- Flat or plastic-looking cabochon on the crown.
- Misspelled or unevenly spaced text at 6 o'clock.
- End links that leave a visible gap against the case.
Dial notes for the white version
The white Tank Must dial has a matte opaline finish that reads flat white indoors and warms slightly in daylight. Copies often read grey or faintly blue under the same light because the base coat is too thin. Check that the sword hands are polished to the same standard as the case, with no burrs on the edges and no tool marks on the flat surface. Push the crown in and out a few times to confirm it seats cleanly and sets the time without slipping.
Before you pay
Ask for photos taken in daylight with no filter, plus a shot of the caseback and the clasp. Compare those images against the official reference at the same angle. If the seller cannot supply clear, dated photos of the actual watch, treat the listing as unverified.