Cartier Tank Must WSTA0106: specifications and what to check

There is no diameter, so stop quoting one

Cartier publishes the case as 33.7 x 25.5 mm, with a thickness of 6.6 mm.

Those are length and width. A Tank is rectangular; it has no diameter, and a single millimetre figure cannot describe it. That is why this reference appears on no case-diameter list on this site — not because the measurement is missing, but because the shape does not have one.

Quote both numbers. A buyer who reads "33.7 mm" alone will picture a small round watch and receive something that wears completely differently: longer down the wrist, narrower across it, and far flatter than any round case at that size.

The 6.6 mm thickness is worth leading with too — thinner than either Santos documented on this site, and slimness is most of what a Tank is for.

High Autonomy is a description, not a number

Cartier specifies the movement as a High Autonomy quartz movement.

That is the entire movement specification. No calibre number. No battery life. No accuracy figure.

The temptation is obvious: the phrase plainly implies a long battery life, so a number gets attached to it from somewhere. Do not. Cartier has chosen not to publish one, and a figure from a retailer's page or a forum is not a manufacturer specification.

Write what the maker wrote — "High Autonomy quartz movement" — and if a buyer presses for a battery interval, say that Cartier does not publish one. That answer is more credible than a confident number you cannot support.

Two more things the page does not state

No crystal material. Cartier lists sapphire on the Santos references and on the Tank Française documented here, and states nothing at all on this one.

Do not carry sapphire across from a sibling reference. Look at the watch in front of you, describe what you find, and mark that sentence as your observation rather than a specification. This is exactly the gap where a dealer assumes and a buyer checks.

No lug width. The bracelet is described as interchangeable steel, which answers the practical question — the bracelet comes off — without giving a millimetre figure for a strap.

Three bar, on a watch that looks like an everyday piece

Water resistance is 3 bar (approx. 30 meters/100 feet).

That is rain and hand washing. Not swimming, not showering, not washing up.

Nothing about the watch signals it. It is steel, it is on a steel bracelet, and it is the Cartier most likely to be bought as a daily watch. Put the limit in the listing in plain words rather than as a figure in a table, and say it again at handover.

The crown is beaded, set with a synthetic cabochon-shaped spinel — a set stone in a working part. Check it for chips and confirm it is firm. The dial is silvered with blued-steel sword-shaped hands; look at the hands under magnification, because blued steel shows handling and heat damage plainly and cannot be touched up.