Name: Cartier Tank Must Large Automatic WSTA0041
Brand: Cartier
SKU: WSTA0041

The Tank Must Large Automatic is the answer for anyone who wants a proper Tank without the compromise of a quartz movement. Cartier released it in 2021 to bring the Must line into the modern era, pairing the correct Tank proportions with an in-house automatic caliber. At 33.7mm it sits at a sensible dress-watch size and lands below the more expensive Tank Louis Cartier.

What it is

The Tank Must name dates to the 1970s, when Cartier used "Must de Cartier" to market more accessible, quartz-driven versions of its classic references. Those earlier Must watches used ETA-sourced quartz movements and were aimed squarely at buyers who wanted the Tank look at a lower price of entry. For decades the Must line remained quartz-only, positioned below the hand-wound Tank Louis Cartier.

The 2021 relaunch changed the formula: Cartier kept the accessible price positioning but swapped in the 1847 MC, their entry-level in-house automatic, finally giving the Must a movement worthy of the case design. The result is the most approachable automatic Tank in the current catalog.

Buying notes

The 33.7mm case reads small on larger wrists, and the lug-to-lug proportion leaves little room for error. Buyers expecting the larger Tank de Cartier footprint will be surprised. Early WSTA0041 production runs showed some variation in dial finish uniformity, particularly on the champagne dials, so inspect in person before buying.

The 1847 MC is a workhorse caliber but it is not decorated or visible through a caseback, which matters if movement quality is part of your calculus. Pre-owned pricing has softened since the 2021 launch hype, which is good for buyers but worth knowing if you are treating this as an investment rather than a watch to wear.

Market read

New, the WSTA0041 retails in the $4,000 to $5,000 range depending on dial and strap configuration, making it the least expensive entry into an automatic Tank. Pre-owned examples have settled roughly 15 to 20 percent below retail as supply has normalized. Demand is steady but not frenzied, so patient buyers can find clean examples from authorized dealers and grey market sources without paying a premium.

Service expectations

The caliber 1847 MC is a robust, low-complication automatic with a 38-hour power reserve. Cartier recommends service intervals of approximately five years, and the movement is fully serviceable at Cartier boutiques and qualified independent watchmakers familiar with the caliber. Parts availability is good given the movement's recency and its use across multiple current Cartier references.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

Mass-produced#3 in family

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Movement tier: unclassified · caliber Cartier Cal. 1847 MC: automatic, in-house, 28,800bph, 42h PR, 23j; used in Tank Must Auto, Cle de Cartier, and Santos Medium Modern · 42h power reserve · see-through caseback · family design Louis Cartier

Small case: suits slender wrists (under 6.5 in / 16.5 cm)

33.7 mm case. A compact, elegant wear. Particularly at home on narrower wrists where larger cases can overhang.

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Authentication

The lacquer dial attracts fakes; dial printing and movement finishing are the primary checks.

Known issues in the market

Replicas with printed rather than genuine lacquer dials; the lacquer surface has a specific depth and gloss that differs from paint.
Vintage "Must de Cartier" text appearing on dials sold as the new automatic Tank Must (they are different models).
Roman numerals in wrong typeface or with inconsistent stroke width.
Cal. 1847 MC not present in exhibition caseback; generic movement substituted.
Cartier typeface errors in the dial text; "CARTIER" or "TANK MUST" with wrong letter proportions.

Area	What to check	What is correct	Red flag
dial	Lacquer dial surface quality	Lacquer dial has a deep, three-dimensional gloss; the surface appears to have depth rather than sitting flat; color is consistent across the full dial (green or red); no micro-bubbles or brush marks	Painted dial that appears flat; micro-bubbles visible under loupe; brush strokes in the color coat; color that is uneven or shows pigment separation
dial	"TANK MUST" text (not "MUST DE CARTIER")	Modern automatic Tank Must shows "TANK MUST" on the dial, not "MUST DE CARTIER"; "AUTOMATIC" text present (quartz "Must de Cartier" vintage pieces do not have it); "CARTIER" signature in correct position	"MUST DE CARTIER" text on a claimed new automatic model; absence of "AUTOMATIC" text; "CARTIER" with incorrect letter spacing or typeface
dial	Roman numerals	Roman numerals in Cartier typeface; consistent hairline serifs; numerals are applied (slightly raised) not printed flat; blued steel sword hands over the lacquer	Numerals that are printed flat rather than applied; inconsistent serif detail; blued hands that are black or grey instead of a genuine blue
crown	Crown with guilloché top	Crown top has fine guilloché (cross-hatched) engraving; blue cabochon is set in the crown; crown is octagonal in profile (traditional Tank crown shape)	Smooth or knurled crown top without guilloché; cabochon absent; crown that is round rather than octagonal in profile
caseback	Exhibition caseback showing Cal. 1847 MC	Cal. 1847 MC visible through caseback; bridges are decorated; Cartier rotor; movement signed on bridges	Any movement other than 1847 MC; undecorated movement; generic ETA movement without Cartier finishing

Common legitimate replacements

Leather strap and deployment clasp are commonly replaced; genuine Cartier accessories have Cartier markings on the clasp.

Expert resources: Cartier boutiques authenticate the Tank Must. The key distinction between the vintage "Must de Cartier" (quartz) and the new "Tank Must" (automatic Cal. 1847 MC) is critical and frequently confused in listings.

Authentication guide

Last reviewed June 2026

The Tank Must revives a colorful chapter of Cartier's history when the Must line made the Tank accessible in steel with lacquer dials. The current Tank Must Large Automatic uses a solid steel case with a black, red, or khaki green lacquer dial and an SIHH-generation movement. The lacquer dial color and the "Must de Cartier" text placement are the primary tells.

Known reproduction risks

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MEDIUM

The Tank Must has attracted reproduction activity due to its accessible price point and distinctive colored dials.

Lacquer color that appears inconsistent or shows slight mottling compared to the flat, even lacquer of originals
Dial text where "Tank Must" appears in incorrect typeface weight or spacing
Crown side position error -- Tank Must has the crown at 9 o'clock, not 3 o'clock

Dial variants by era

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Era	Description	Identifiers
2021 to present (black lacquer)	Matte black lacquer dial with white Roman numerals, blued sword hands.	Matte black dial surface with consistent light absorption and no sheen White Roman numerals rather than black -- the Must uses white on black for contrast "Tank Must" text on the dial below 12 o'clock; this reference includes the Must designation explicitly "AUTOMATIC" text on the dial Blued sword hands in standard Cartier profile
2021 to present (khaki green lacquer)	Khaki green lacquer dial with matching Roman numerals in a contrasting tone.	Lacquer surface in a desaturated olive/khaki green -- not bright green, not yellow-green Roman numerals in a contrasting tone printed over the lacquer surface Blued hands identical in profile to other variants A correct khaki green is consistent under different light temperatures -- it does not shift to yellow or brown
2021 to present (red lacquer)	Red lacquer dial variant; the most visually assertive of the Must trio.	Lacquer surface in a saturated red; consistent under multiple light sources Roman numerals in white or cream on the red ground "Tank Must" and "AUTOMATIC" text in white

Service part flags

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Lacquer dial (color consistency)

Original: The lacquer dials are smooth with consistent color from center to edge. There is no texture or brush pattern visible. The print of the Roman numerals is clean-edged under magnification.

Replacement tells

Any mottling or variation in the lacquer color across the dial surface
Lacquer surface that shows crazing (fine crack patterns) suggesting age inconsistency with a stated 2021+ example
Roman numerals with fuzzy edges or ink spread when viewed under 5x magnification

Case back markings

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2021 to present

Solid caseback with reference WSTA0041 and serial number
"CARTIER" text, "ACIER", water resistance
Cal. 1847 MC designation on documentation
"Swiss Made"

Movement tells

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Cal. 1847 MC automatic; same movement as other current steel Cartier references. Solid caseback.
Movement service should leave the dial undisturbed; a replaced dial would change the color-correct Must presentation entirely.

Sources: Cartier official -- Tank Must.