Name: Cartier Santos de Cartier (medium, steel) WSSA0029
Brand: Cartier
SKU: WSSA0029

The Santos is the watch Louis Cartier designed for the Brazilian aviator Alberto Santos-Dumont in 1904, arguably the first purpose-built wristwatch. The current production 'Santos de Cartier' line returned in 2018 in two case sizes; the medium-steel reference is the wear-anywhere, integrated-bracelet daily that has quietly become one of the best-value Cartier sport-dress watches in the modern catalog.

What it is

Cartier produced the Santos for Santos-Dumont in 1904; commercialized 1911 (predating the Tank by six years). The modern 'Santos de Cartier' line launched 2018 replacing the 2014-era Santos 100, with QuickSwitch interchangeable strap/bracelet system and the in-house caliber 1847 MC automatic. Steel, two-tone, and full-gold variants exist; the steel-medium (35mm wide, 41.9mm lug-to-lug) is the canonical buy.

Buying notes

Common things to check: bracelet (the steel Santos bracelet is part of the watch's identity, verify it ships with the watch and is sized appropriately; the QuickSwitch system means many examples sell with strap-only); dial freshness (the silvered dial ages well, but service-replacement dials are a flag, look for crisp Roman-numeral printing); screws (the Santos's exposed screws are a signature; mismatched or replaced screws disclose service history); QuickSwitch mechanism (the bracelet-to-strap quick-change should engage and release smoothly).

Market read

Steel-medium Santos examples trade at meaningful discounts to retail (~20-25%) in the secondary market. The Santos is one of the few modern Cartier references widely-available at retail without a waitlist; that availability keeps secondary-market pricing honest. Two-tone and full-gold variants trade at proportionally higher absolute prices but similar percentage discounts.

Service expectations

The caliber 1847 MC is a modern automatic produced for Cartier; service is performed by Cartier and select Cartier-authorized independents. Service interval is 7-10 years; cost is modest by haute-horlogerie standards.

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Mass-produced#1 in familyOfficial press photos

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Movement tier: unclassified · caliber Cartier Cal. 1847 MC: automatic, in-house, 28,800bph, 42h PR, 23j; workhorse Cartier automatic used across Santos and other sport-dress lines · 42h power reserve

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

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

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Authentication

Skeleton screws on the bezel and exposed bracelet screws must align perfectly; misalignment or non-functional screws indicate a fake

Known issues in the market

Bezel screws on fakes are often decorative and do not have a genuine screw head profile under magnification
Integrated bracelet link pitch and screw spacing is difficult to replicate accurately
ADLC-coated dark steel variants are often misrepresented; verify coating consistency and hardness with a loupe
Interchangeable strap system on modern Santos (post-2018) has a specific mechanism; fakes use a different attachment method

Area	What to check	What is correct	Red flag
case	Bezel skeleton screws	Eight skeleton screws on bezel are functional Phillips-head type; screws have correct pitch and screw head profile; "Cartier" on crown with sapphire cabochon; case proportions 35.1mm x 41.9mm for medium	Screws printed or non-functional (cannot turn); incorrect screw head profile; crown without sapphire; case dimensions inconsistent with medium spec
bracelet	Integrated bracelet with exposed screws	Each link has a visible screw on one side; screw spacing is consistent and even; bracelet tapers correctly; brushed center links with polished edges; "Cartier" on folding clasp	Screw spacing irregular; screws are printed or have no screw profile; bracelet does not taper; clasp without "Cartier" engraving
dial	Roman numeral dial and date at 3	"Cartier" at 12; Roman numerals with Arabic "7"; date window at 3 with correct magnifier; "Santos de Cartier" text; blue sword hands	Missing "Santos de Cartier" text; date magnifier absent or mis-positioned; Arabic "7" missing; incorrect hand shape
movement	Cal. 1847 MC or SIHH variant	Exhibition caseback on some variants shows movement; "Cartier" signed; automatic rotor; Cal. 1847 MC or 1608 MC depending on production year	Quartz movement in mechanical Santos; incorrect calibre for documented variant; solid caseback where exhibition is expected

Common legitimate replacements

Modern Santos has interchangeable leather strap system; aftermarket leather with non-Cartier attachment tools is common.
Bracelet screws can be over-tightened during sizing; stripped screw heads are a secondary market concern.

Expert resources: Cartier service centers authenticate via serial. Watchuseek Cartier and r/Cartier have Santos screw-pattern authentication guides with macro photography.

Authentication guide

Last reviewed June 2026

The Santos medium in steel/rose gold is among the most replicated dress sport watches in the world, with Chinese factory output that closely mimics the integrated bracelet and screwed-bezel aesthetic. The bezel screw profile, the integrated bracelet link geometry, and the QuickSwitch mechanism are the fastest authentic tells.

Known reproduction risks

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HIGH RISK

Chinese factory replicas with near-correct case proportions, printed Roman numerals rather than applied, and movements sourced from Miyota or generic clone suppliers. Volume is high due to the Santos popularity at the bicolor price point.

Roman numeral markers that are printed flat rather than individually applied with depth and consistent height
Bezel screws with off-center or asymmetric slots under loupe
Crown stone with purple or violet cast rather than clean deep blue
Bracelet link finishing with blurred or imprecise brush-to-polish transitions
QuickSwitch mechanism absent or present but non-functional

The Chinese factory output for the Santos bicolor is high enough that any gray market example under $3,000 warrants in-person inspection before purchase. The bezel screw slot quality under a loupe is the single fastest tell that can be done without removing any parts.

MEDIUM

Steel-only Santos examples with aftermarket bicolor bracelets or bezels to present as more expensive bicolor variants.

Rose gold elements with color inconsistent with the case metal finish under the same light source
Bracelet link proportions that do not match the known Santos bicolor link geometry
Bezel screw material (steel on a stated rose gold bezel variant)

Dial variants by era

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Era	Description	Identifiers
Current Santos Medium (WSSA0030 and related refs)	Silver-colored brushed dial with applied Roman numerals, blued sword-shaped hands, integrated bracelet in steel and rose gold.	Brushed silver dial with blue-steel Roman numeral applied markers Blued steel sword hands in correct Cartier proportion "CARTIER" text on the dial at the correct position (between 12 and the upper markers) "PARIS" text on the dial below the Cartier text "AUTOMATIC" or appropriate complication text on the lower dial No date window on the base Santos medium reference -- any aperture is incorrect for this variant

Service part flags

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Bezel screws

Original: The bezel is secured to the case by eight visible polished screws with correct slot geometry. On genuine Santos examples, the screw heads are polished and the slots are precisely cut and aligned. On the bicolor steel/rose gold variant, the screws are in rose gold.

Replacement tells

Screw heads with slot cuts that are off-center, inconsistent in width, or show tool marks from a driver that was the wrong size
Screws with surface finish (matte vs. polished) inconsistent with the case metal specification
Any screw that is loose or has visible thread damage -- the bezel screws should not move under normal wear
Rose gold-colored screws that do not match the finish quality of the bracelet rose gold elements

Integrated bracelet

Original: The Santos integrated bracelet uses alternating brushed and polished links in a specific width and taper. On the bicolor variant, alternating links are rose gold and steel. The QuickSwitch system (introduced in recent generations) allows the bracelet to be removed without tools.

Replacement tells

Bracelet with inconsistent link width or spacing -- the Santos bracelet has a specific taper from the case to the clasp
Brushed/polished finish transitions that are not crisp at the link edges
QuickSwitch mechanism that releases with no resistance -- the mechanism should require deliberate pressure to actuate
Aftermarket bracelet without the QuickSwitch system on a stated current-production example
Rose gold elements with a color that differs from the case rose gold under the same light source

Dial Roman numerals

Original: Applied Roman numerals in blued steel. Each numeral is individually set. They should have consistent height relative to the dial surface, consistent blue coloring, and the same surface finishing.

Replacement tells

Roman numerals that appear printed or shallow rather than individually applied with depth
Color inconsistency between numerals -- a replaced numeral will often be a slightly different blue shade
Numeral height inconsistency under loupe: one numeral sitting lower or higher than its neighbors indicates replacement or dial damage

Crown

Original: Round cab crown with the Cartier blue spinel. The blue stone should be a faceted synthetic spinel, set in a polished bezel. The stone has a characteristic deep blue without any purple shift.

Replacement tells

Crown stone that shows a purple or violet cast rather than a clean deep blue
Crown without any stone -- aftermarket crown replacements often use a plain steel cap
Stone that is flat-topped rather than slightly convex (cabochon profile)
Crown bezel that shows any tool marks or finish degradation inconsistent with the case quality

Case back markings

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Current Santos Medium

Solid caseback with engraved Cartier text and reference
WSSA0030 (or relevant reference) on the case band
"Swiss Made" on the dial at 6 and on the caseback
Case material hallmarks: 750 for rose gold elements if applicable
"Cartier" engraved on the caseback in correct typeface weight and depth
Water resistance: 10 ATM (100M) -- engraved on the caseback

Movement tells

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The Santos medium uses Cal. 1847 MC (or in newer models, Cal. 4002 MC). Cal. 1847 MC is a robust ETA 2892-based caliber -- the bridge layout through an opened caseback should match the 2892-derived geometry.
Cal. 1847 MC beats at 28,800bph with a 42-hour power reserve. A fully wound Santos that runs less than 36 hours warrants service.
The seconds hand should stop precisely when the crown is pulled to the time-set position. If the seconds continues running with the crown pulled, the hacking lever is worn.
Cartier movements at this tier are serviced on 5-year intervals. Movement finishing through the caseback should show even brushing on the plate and rotor -- Cartier signed movements should not have poorly finished surfaces.
The quick-set date function (on date variants) should advance the date with a single crown push without requiring a full crown pull to the time-set position. If the date requires full setting-position crown pull to advance, the quickset mechanism has failed.

Sources: Cartier -- Santos de Cartier technical specification and movement documentation; WatchUSeek -- Cartier Santos authentication forum; Chrono24 -- Santos bicolor buyer's guide.