Cartier Tank Must / Must de Cartier Vermeil — Intro

The Cartier Tank is one of the most iconic rectangular wristwatches in horology. Many of the vintage pieces stocked at KOKO WATCH come from the Must de Cartier line (also known as Tank Must) in vermeil. This guide covers the history, what vermeil means, and the common SM / LM sizes.

A brief history of the Tank and Must de Cartier

Louis Cartier conceived the Tank in the 1910s. Its form was inspired by the side profile of a tank: straight brancards, Roman numerals, and blued-steel hands — a signature of Cartier design language.

In the late 1970s, Cartier introduced the Must de Cartier collection — keeping the classic Tank lines while using more accessible materials and variants so more people could own the “Must” look. On the vintage market, Must-line Tanks (especially vermeil) remain highly sought after and are among the styles we stock most often.

What does vermeil mean?

Vermeil (French) means a layer of gold plating over a sterling silver case. In short: silver underneath, gold on the surface — it looks like gold but is not a solid-gold case.

  • Case backs or inner lids often carry silver / vermeil hallmarks (these vary by era and place of manufacture)
  • With long wear or imperfect care, the gold layer can thin or show silver underneath — normal ageing on vintage vermeil, not a sign of a fake
  • When judging condition, look beyond the gold surface: craftsmanship, dial, and movement matter too

Our Tank Must vermeil listings note materials and condition highlights on each product page. Questions welcome — please DM us.

Common sizes: SM and LM

Vintage Tank Must pieces are often labelled SM (Small) or LM (Large / larger case). Exact millimetres vary by reference, era, and how you measure (lug-to-lug vs. case only).

  • SM: a finer case — suits those who prefer a refined proportion or a smaller wrist
  • LM: a slightly larger case; many Tank Must vermeil pieces in our shop are listed around 23×31mm (always check the individual product page)

Choose size against your wrist and daily style: vintage watches are about proportion and character — bigger is not always better.

Movements and practical notes

Must-line vintage Tanks appear in quartz and hand-wound / mechanical versions. We check running condition before listing and note it in the description. These are pre-owned / aged pieces: service history and timekeeping vary by watch. We do not guarantee factory Cartier service or new-watch standards.

Browse current Tank Must vermeil stock in the Cartier Tank collection. For condition or detail questions on a specific watch, please DM us.

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