The closest match you can find in a Cartier Tank Must leather strap replica is a steel Tank Must Large with a 33.7 x 25.5 mm case, a flat sapphire crystal, a Swiss-style quartz movement and a matte calfskin strap on a signed pin buckle. Judge any copy against five things: case proportions and thickness, crystal material, dial printing and numeral geometry, movement type, and strap and buckle quality. Everything else, including box and papers, is secondary to those five.
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Case proportions and caseback
The Tank Must is a rectangular watch, and rectangles expose errors that round watches hide. The Large model measures roughly 33.7 mm across by 25.5 mm tall, with the Small at roughly 29.5 x 22 mm. Ask for caliper photos across the case and a side profile shot.
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- Good signs: sharp, unrounded brancards (the vertical side bars); a flat caseback that sits flush; an even brushed finish on the sides with polished bevels; engraving that is shallow and crisp.
- Warning signs: a case that looks squat or too tall in profile; softened corners from over-polishing; laser engraving on the back that looks grey and pixelated; water resistance claimed above 30 m, which the genuine watch does not carry.
Crystal and dial
The genuine Tank Must uses sapphire. Many copies use mineral glass or a sapphire-coated mineral, which you can usually spot by a slightly warm or hazy edge under a light.
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- Good signs: a flat crystal with no dome and no blue glare tint; a printed railway minute track with even spacing; Roman numerals that are properly proportioned and sit clear of the track; sword hands that reach the minute track without overrunning it; a clean Cartier script with no thickening in the loops.
- Warning signs: a domed or thick crystal; numerals that crowd the track or vary in weight; a printed signature that blurs in macro photos; uneven lume-free hands with rough edges. Cartier has used a micro-engraved signature inside a numeral on several Tank references, so ask for a macro shot and check that it reads as etching rather than a printed smudge.
Movement: quartz is correct here
The Tank Must is a quartz watch, including the SolarBeat version. That makes movement checks simple and it exposes one common lie.
- Good signs: a seconds hand that ticks once per second; a smooth-setting crown with light detents; a battery hatch or screw-secured back that opens without damage.
- Warning signs: a listing that advertises an automatic movement in a Tank Must. No such watch exists, so the claim signals a seller who is guessing or dressing up a different case.
Strap and buckle
On a leather strap model the strap carries as much of the impression as the dial. Lug width must match the case: a strap that leaves a visible gap at the lugs or bulges past them is the fastest tell in person.
- Good signs: matte or semi-matte calfskin with tight, evenly spaced stitching; a steel ardillon buckle with deep, sharp Cartier engraving; a strap that tapers cleanly and sits flat against the wrist.
- Warning signs: glossy corrected-grain leather; stitching that wanders or uses a contrasting thread the genuine strap does not use; a stamped buckle with soft lettering; quick-release spring bars where the original uses standard bars.
Budget for a replacement strap regardless. A quality aftermarket calfskin strap in the correct width lifts a mid-tier copy more than any other single change.
Small or Large, and which to buy
Pick the size you would wear in the genuine watch, then verify the copy matches those dimensions. The Small suits narrow wrists and reads as a dress watch; the Large is the safer unisex choice and the version most often reproduced well, because the larger dial gives printers more room to get the numerals right.
- Choose Large if: your wrist is 6.5 inches or above, or you want the version with the widest choice of case finishing.
- Choose Small if: you want a vintage proportion and your wrist is under 6.5 inches. Expect fewer accurate copies.
Questions to ask before paying
- Send macro photos of the dial, caseback engraving and buckle, plus a side profile.
- Confirm the exact case dimensions in millimetres rather than the model name.
- Confirm crystal material in writing.
- Ask for a short video showing the seconds hand and the crown action.
- Confirm the strap width in millimetres.
One legal note for US buyers: selling counterfeits carrying a brand name is illegal, and shipments can be seized by customs. Treat this guide as information about what distinguishes a well-made replica from a poor one, and understand the risk before you order.