Cartier Tank Francaise 20mm Stainless Steel
+9 % above RRP
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ℹ️ 1-month trend
Price change over the past 30 days. Shows the short-term market movement — relevant if you want to buy or sell soon.
ℹ️ 4-month trend
The central metric behind the momentum score. It filters out short-term swings and shows the true, medium-term market trend of this reference.
ℹ️ Volatility
Annualised price fluctuation. Below 10 % = very stable, 10–20 % = normal, above 20 % = volatile. With high volatility the price can change quickly — in both directions. Be cautious about buying without checking the current price.
ℹ️ Momentum score
ChronoCheck's own indicator from 0 to 100, calculated from the 4-month trend, volatility and market direction.
- Above 60 — Upward trend. Good time to sell, prices are rising.
- 40 – 60 — Neutral. Stable price level, no pressure to act.
- Below 40 — Downward trend. Wait or enter at a good price.
ℹ️ Investment Grade A/B/C/D
ChronoCheck's own rating for each reference. A 0–100 point scale, made up of four weighted components:
- Momentum (40 pts) — trend strength from the momentum score.
- Liquidity (25 pts) — number of active live listings.
- Stability (20 pts) — inverse volatility — the calmer, the better.
- Source robustness (15 pts) — number of independent market sources.
- A · 75+ Trend is right, liquidity good, data broad.
- B · 55–74 Solid, but one component weaker.
- C · 35–54 Average, volatility or market breadth weigh on it.
- D · below 35 Downward or too little data — a collector's piece.
Not investment advice. Pure data analysis from aggregated market sources.
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Technical data
Cartier Ref. W51027Q4 — Variants and collector names
Known as: Tank Française Small Bicolor RG, Tank Française Two-Tone Rose Gold, MOP Tank Française Small Steel/RG
Movement variants
- 057 (2006–today)
Bezel variants
- W51027Q4-Case-SteelRG-Polished "Tank Française Small Bicolor Crown"
Dial variants
- Pink MOP Roman — Black radial Roman numerals, inner minute track, Cartier signature at 6 o'clock
Crystal variants
- Saphirglas-TankFrancaise-Small
Bracelet variants
- Tank Française Maillon Bicolor Small Stahl/RG Ref. W51027Q4-Maillon-Steel-RG-Small
Cartier lists reference W51027Q4 as the Tank Française Small in steel and rose gold, powered by the quartz Caliber 057. In the trade it goes by several names, most commonly Tank Française Small Bicolor RG. Some dealers simply call it Two-Tone Rose Gold, while others work the mother-of-pearl shorthand MOP straight into the title. The small case size makes this the go-to entry point into the Tank Française family, especially for buyers after 25 to 26 mm rather than the 30 mm of the midsize version.
## The Dial That Makes the Difference
What sets the W51027Q4 apart from the plain steel version sits under the sapphire crystal: a pink mother-of-pearl dial with Roman numerals, tracked internally as the Pink-MOP-Roman-Dial. As the light shifts, the surface plays between rose and champagne, a detail entirely absent on the standard steel models. It's exactly this dial type that regularly commands a premium of 300 to 500 euros over the plain white dial on the secondary market.
## Case and Crown in Bicolor
The case pairs polished steel with rose gold on the bezel, bracelet links and crown, catalogued as the Tank Française Small Bicolor crown. That crown, set with a blue spinel cabochon, is the first thing any inspector checks on a pre-owned example, since a replaced or misaligned crown usually gives itself away under 10x loupe magnification. Anyone buying a W51027Q4 should check the dial shade, the crown setting and the Caliber 057 movement engraving together, not one after the other.
Brand profile: Cartier
Cartier watches (Santos, Tank, Ballon Bleu) are popular targets for counterfeiters. The distinctive design (Roman numerals, blue sword hands) is recognizable — but also easy to copy.
- Sapphire cabochon crown: on genuine pieces it's SET INTO THE METAL (bezel-set); on fakes it's usually GLUED. Test: loupe — adhesive residue around the edge = fake.
- Bracelet screws: genuine Cartier bracelets ALWAYS have visible screw slots. Pins instead = fake.
- 'Swiss Made' at 6 o'clock: MICROPRINTED directly beneath the 6 o'clock marker. Fakes often omit it or print it crooked.
- Guilloché pattern: under 10x magnification, EXACTLY parallel and uniformly deep. Irregularities = fake.
Serial number format: Cartier serial numbers: alphanumeric, on the case back. Older models: number located between the crystal ring and the case. New purchases come with a Cartier passport.
Further sources
Buying guide: Cartier Tank Francaise 20mm Stainless Steel
Entry into Cartier
At $5,327 this reference is one of the more affordable ways to wear a Cartier on your wrist. That is precisely why many pieces have already passed through several hands — condition varies accordingly. Buyers here should pay particular attention to service history and honest photos from the seller.
Watch out for swings: This reference has an above-average volatility of 333.5 percent. In concrete terms: the price can move by several hundred euros within a few weeks. Check the current value before buying or selling — old listings or auction results from two months ago are of little help.
What to look out for when buying?
- Authenticity: The serial number and reference on the case must match the papers. A professional authenticity check of the Cartier Tank Francaise 20mm Stainless Steel reliably rules out counterfeits.
- Condition: Check scratches on the case and bezel — professional refurbishment can leave traces.
- Service history: A documented service by the manufacturer or a certified watchmaker increases the value.
- Scope of delivery: Box, papers and warranty card make a noticeable price difference on the Tank Francaise 20mm Stainless Steel.
- Independent certification: The CPS-52 standard covers 52 checkpoints — from the serial number and the timing machine to water resistance. The result is secured on the blockchain and can be verified at any time.
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