Tank Must

The Most Important Cartier Watch You Can Buy for Under $2,000

The Tank Must is not the most expensive Cartier, not the rarest, and not the most technically accomplished. It is, however, arguably the most consequential. When Alain-Dominique Perrin launched the Les Must de Cartier line in 1977, he solved a problem that had constrained luxury goods companies for decades: how to grow the customer base without cheapening the brand. The answer was vermeil — gold-plated sterling silver that looked and felt like a Cartier but cost a fraction of an 18k gold Tank Louis.

The commercial impact was immediate and transformative. Before Must, Cartier's watches were objects for the wealthy. After Must, Cartier was a brand that aspirational buyers could access — and did, in enormous numbers. The Les Must de Cartier boutiques that opened worldwide through the late 1970s and 1980s were built on the Tank Must's commercial success.

The Vermeil Innovation

The Must's case construction was the key innovation. Vermeil — sterling silver coated with a layer of gold at least 2.5 microns thick — gave the watch the visual warmth and weight of gold at a dramatically lower material cost. The technique was not new (vermeil has existed for centuries in French decorative arts), but applying it to a luxury watch and selling it under the Cartier name was a radical commercial decision.

The early Must watches (1977–early 1980s) used manual-wind movements, maintaining a connection to traditional watchmaking. As the line matured, Cartier transitioned to quartz movements — a practical decision that kept the watches thin and low-maintenance for the non-collector audience the Must was designed to serve. Collectors today tend to prize the earlier manual-wind examples for their mechanical character, but the quartz models are the ones that drove the line's commercial success.

The Colored Lacquer Dials

The Must's most distinctive feature — and the one that drives the majority of collector interest today — is the colored lacquer dial. While standard silver or white dials were available, the colored variants became the Must's signature: deep burgundy, midnight blue, emerald green, and classic black, each achieved through layers of hand-applied lacquer over the dial surface.

These colored dials have proven to be both the Must's greatest aesthetic asset and its most fragile component. The lacquer is organic and reacts to moisture, temperature, and UV exposure over decades. Perfect examples with no cracking, flaking, or fading are becoming increasingly scarce as the surviving population ages — which is precisely why they command the strongest premiums in the secondary market.

The Tri-Color Dial

A distinct variant from the solid-color lacquer models, the tri-color (or tricolor) dial divides the dial surface into three horizontal bands — typically ivory, burgundy, and black or dark blue — creating a striking geometric effect. This design reference appeared across the broader Les Must de Cartier product line (lighters, pens, leather goods) and became an immediately recognizable visual signature of the brand's 1970s and 1980s identity.

The Must Today

The vintage Tank Must occupies a unique position in the market: it is the most affordable entry point to genuine vintage Cartier, with good examples available well under $2,000. This accessibility has made it a gateway watch for new collectors discovering vintage Cartier, and a favorite of the fashion-aware buyer who values the colored lacquer dials as wearable design objects. The 2021 reissue of the Must (with modern specs and pricing) has only increased interest in the originals — vintage buyers can get the authentic 1970s/80s article for less than the new version costs.