Must de Cartier - the Art of the Dial

In the world of horology, few stories are as instructive — or as romantically French — as that of the Must de Cartier. Born from crisis and creative boldness in the early 1970s, this iconic Cartier watch line democratised luxury, transformed a jeweller's house into a global empire, and produced some of the most visually extraordinary dials in the history of watchmaking.

This guide covers everything a collector or enthusiast needs to know: the origins of Les Must de Cartier, the design DNA of the Cartier Tank Must, and an in-depth breakdown of every major dial family — from the classic ivory Roman numeral to the rare cloisonné and Japan-exclusive variants.

The History of Les Must de Cartier

By the early 1970s, Cartier was magnificent but narrow. Its watches — including the legendary Tank, designed by Louis Cartier in 1917 — were cased exclusively in 18-karat gold or platinum. Production ran to roughly 3,000 pieces per year. The looming Quartz Crisis, the disruptive flood of accurate Japanese movements, was about to unsettle the entire Swiss watch industry. Something had to change.

The Birth of the Must Concept (1972)

The catalyst arrived in 1972, when a group of investors led by entrepreneur Robert Hocq acquired Cartier Paris. Hocq had built his fortune in lighters and had a natural instinct for aspirational objects that middle-class consumers coveted but couldn't afford. According to a widely repeated story, the name of the new line emerged spontaneously: a staff member blurted during a brainstorming session, "Cartier — c'est un must!" The phrase stuck.

Hocq appointed Alain-Dominique Perrin as General Director. Perrin's advertising background gave the line its confident cultural voice. Together, they created not merely a product line but a new philosophy of luxury: recognisably Cartier objects at a democratic price, made possible by substituting vermeil — sterling silver electroplated in gold — for solid precious metal.

Cartier Monde and Global Expansion

In 1974 and 1976, the group reacquired the long-independent Cartier London and Cartier New York branches. By 1979, all three houses were unified under Cartier Monde, creating for the first time a single, coherent global Cartier brand — with the Must de Cartier watch at the centre of its identity. The results were staggering: Cartier went from producing roughly 3,000 watches per year to over 160,000 by the end of the decade.

"From selling just 3,000 watches a year, by the end of the 1970s Cartier had exceeded the 160,000 mark." — Industry Record, Cartier Monde

The Must de Cartier Tank: Design & Construction

The Cartier Tank Must launched at approximately US$500 — accessible by design, without sacrificing an ounce of Cartier's visual identity. Vermeil cases — sterling silver (92.5% pure silver alloy) electroplated in gold to a minimum thickness of 2.5 microns — gave the watch the weight and warmth of solid gold at a fraction of the cost. Early models used manual-wind calibres based on the ETA 2512-1; from the late 1970s onward, Cartier transitioned to quartz movements (calibres 81, 90, 057, 687, 690).

Everything else was unmistakably vintage Cartier: the signature rectangular brancards, the blue spinel cabochon crown, the blued steel sword hands, the railway-track minute chapter, and Roman numerals with the characteristic hidden secret signature within one index.

Must de Cartier Dial Designs: The Complete Guide

What elevated the Must de Cartier above any ordinary accessible luxury watch was its extraordinary range of dial designs. Cartier treated the dial as a jeweller's canvas — a small but precious surface for chromatic experiment, material play, and craft sophistication. The result was one of the most varied dial repertoires in watchmaking history.

1. The Classic Roman Numeral Dial (Ivory & White)

The most iconic Must de Cartier dial is the classic Roman numeral on an ivory or white lacquered ground. Black Roman numerals, a fine railway-track chapter ring, blued sword hands, and the Cartier signature below twelve — this is the vintage Cartier watch in its purest form. The secret signature — a tiny signature concealed within the VII or X index — is a detail enthusiasts actively seek.

2. The Black Roman Numeral Dial

Considerably rarer and more desirable than the ivory variant, the black Roman numeral dial — white numerals on a deep black lacquered ground — is associated predominantly with the earliest manual-wind period (c. 1976-1981). Black lacquer is more susceptible to spidering, the fine network of hairline fractures caused by contraction and age. Pristine examples command a significant premium on the vintage Cartier market.

3. The Trinity Dial

For many collectors, the Trinity dial is the single most beautiful configuration in the entire Must de Cartier repertoire. It takes its inspiration from the Cartier Trinity ring, designed by Louis Cartier in 1924: three interlocked bands in yellow gold, white gold, and rose gold, symbolising fidelity, friendship, and love. Translated onto the dial surface (first appearing around 1980), the Trinity dial places parallel stripes of contrasting gold tone across the dial centre, giving the watch an almost jewellery-like animation on the wrist.

Photo credits - Le Petit Suisse

Within the Trinity family, collectors distinguish: the horizontal centre stripe (most common), the lateral "Side Trinity" or "Column Trinity," and the vertical stripe variant associated with the earlier manual-wind period.

4. Lacquered Colour Dials

When Les Must de Cartier launched in the late 1970s, one of its most radical decisions was to offer the watch with vividly coloured lacquered dials — a deliberate break from every Cartier tradition that had preceded it.

5. Tortoiseshell and Wood-Effect Lacquer Dials

Beyond solid colours, Cartier explored elaborately textured lacquer techniques in the 1970s and 1980s. The tortoiseshell dial uses layered lacquer in amber, brown, and black to mimic natural shell. The wood-grain dial imitates organic timber grain. Both have aged into something close to museum pieces.

Photo credits - Le Petit Suisse

6. Faux-Stone Dials: Lapis Lazuli and Onyx

The lapis lazuli dial reproduces the deep, mottled midnight-blue of that ancient stone, often with gold flecks simulating mineral inclusions. The onyx dial (black lacquer dial)  aims for the deep, glassy black of polished onyx — offering the visual grammar of jewellery without the cost of actual stone.

Photo credits - Le Petit Suisse

7. The Column Dial

The Column dial (entering production in the late 1980s) arranges Roman numeral hour markers in two vertical columns flanking the dial centre — geometric, almost Art Deco in its planar rigidity. Collectors describe this rare Must Tank variant as "brilliant" and "funky."

Photo credits - Le Petit Suisse

8. The Sunray Dial

Appearing from approximately 1980, the Sunray dial features fine radial lines emanating from the dial centre — guilloché or engine-turning in its engraved form. The surface reads differently in morning light than in candlelight, giving the watch an animated, jewellery-like quality.

Photo credits - Le Petit Suisse

9. The Cloisonné Dial

The most technically ambitious Must de Cartier dial and the most coveted by serious collectors. First appearing around 1985, the cloisonné dial employs thin metal wire (cloisons) applied to the dial surface, creating a framework of compartments that serve as hour markers. The raised wire casts fine shadows and creates a three-dimensional depth unlike any flat-printed dial. Examples in fine condition are among the most expensive vintage Cartier watches on the market.

Photo credits - Le Petit Suisse

10. Arabic Numeral and Breguet Numeral Dials

The Must Tank was produced in small quantities with Arabic numeral dials — a much rarer variant. An extremely limited edition of reportedly just 500 pieces features Arabic numerals at 12 and 6. Even rarer are examples bearing Breguet numerals, which give the Must Tank a distinctly antique, haute horlogerie character.

Must de Cartier Dial Rarity Guide

Collectors and specialist dealers broadly agree on the following rarity hierarchy for Must de Cartier dial types.

Must de Cartier Dials for Foreign & Specialist Markets

Japan-Market Variants

Cartier developed specific Must Tank variants for the Japanese market — including sector and Art Deco-inspired configurations in quantities as small as 500 pieces, and Christmas limited editions exclusive to Japan. The Art Deco Must Tank (reference 1616, 1995) was a worldwide limited edition of just 1,000 pieces, and has become one of the most sought-after of all Must de Cartier references globally.

The 2021 Tank Must Revival

In 2021, Cartier revived the Must concept under the name Tank Must in stainless steel. The chromatic boldness of the original was fully restored: lacquered green, red, and blue dials directly echoed the vibrancy of the 1977 originals. The green-dialled Tank Must became an instant sensation, briefly trading on the secondary market at more than double its retail price. The revival confirmed that the Must de Cartier concept — democratic price, vivid dialling, undiluted design identity — retains all of its power nearly half a century on.

Conclusion

Les Must de Cartier occupies a singular position in the history of luxury watchmaking: as both a commercial masterstroke and a genuine design achievement. The line saved Cartier's finances, transformed its global identity, and inspired a generation of collectors who now seek its most elusive dial configurations with the same intensity that drives the pursuit of far more expensive horological rarities.

The dial, in the Must de Cartier context, was never an afterthought. It was the argument. In the Trinity's shifting tricolour gold, in the lacquered burgundy of an early quartz example, in the jeweller's wire of a cloisonné index, in the solar cell hidden within a Roman numeral — Cartier was making the case, over and over, that a watch costing $500 in 1977 could carry the same creative intelligence, the same formal refinement, the same sense of occasion as any object in the house's history. The vintage market's continuing enthusiasm suggests that argument has been fully, and finally, won.