Short answer: A convincing fake Cartier Tank Must Small gets the 29.5 by 22 mm steel case and the lacquered dial close. It usually fails on three points: the quartz movement, the blue cabochon crown, and the depth of the caseback engraving. Check those first. A replica that passes all three is worth a second look at the dial.

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Prerequisites

  • A 10x jeweler's loupe or a phone macro lens.
  • The reference specs written down: 29.5 x 22 mm case, 6.6 mm thick, quartz caliber, sapphire crystal, 30 m water resistance.
  • A written return window agreed before payment.

Step 1: Measure the case before anything else

  1. Place the watch dial down on a flat surface and measure the case across its widest point, excluding the crown.
  2. Confirm the reading sits at 29.5 mm wide and 22 mm lug to lug.
  3. Measure the thickness at the caseback edge and confirm it reads near 6.6 mm.

Oversized cases are the most common failure on small Tank imitations, because many factories reuse a mid-size blank and scale the dial artwork to fit.

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Step 2: Read the dial at loupe distance

  1. Look at the VII numeral with the loupe and find the micro-printed CARTIER hidden inside the strokes.
  2. Check that the printed Roman numerals have sharp square terminals with no ink bleed.
  3. Confirm SWISS MADE sits below the VI numeral on a single baseline, with even letter spacing.
  4. Inspect the blued sword hands for a flat, matte finish rather than a glossy painted blue.

The secret signature is the single fastest tell. Low-cost imitations print the numerals as one flat graphic and skip the hidden lettering entirely.

Fake Cartier Tank Must Small Replica Guide

Step 3: Inspect the crown

  1. Turn the crown with the loupe on the cabochon and check that the stone is a domed blue spinel with a visible smooth surface, not a painted plastic cap.
  2. Confirm the crown sits centered in the caseband with an even gap above and below.
  3. Pull the crown to the setting position and feel for a firm, short click.

Step 4: Study the caseback engraving

  1. Angle the caseback under a lamp and confirm the reference numbers are cut into the metal, not printed on it.
  2. Run a fingernail across the engraving and feel for a crisp recessed edge.
  3. Check the caseback screws for flush seating and uniform slot depth.

Step 5: Test the movement

  1. Watch the seconds hand for a full minute and confirm it jumps once per second, since the genuine Tank Must Small is quartz.
  2. Listen at the caseback for a single clean tick rather than a fast buzz.
  3. Ask the seller for the stated battery life and expect a figure close to eight years on a genuine-grade quartz caliber.

A smooth sweeping seconds hand on a Tank Must is a warning sign, not a premium feature. It means an automatic movement was fitted where a quartz caliber belongs.

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Step 6: Check the strap and buckle

  1. Inspect the stitching on both sides of the strap and confirm the thread matches the leather color and sits flat.
  2. Turn the buckle over and check that the maker's mark is stamped, centered, and legible.
  3. Flex the strap and confirm the leather creases without cracking at the lugs.

Buy the piece as a replica, price it as a replica, and keep the return terms in writing. A seller who avoids that conversation is telling you something about the watch.