Cartier Tank Must, Large Model, Quartz Movement, Steel, Le
10 % below 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. WSTA0109 — Variants and collector names
Known as: Tank Must Large Steel, Must Large, Tank Must Quartz Large
Movement variants
- 157 (2021–today)
Bezel variants
- WSTA0109-Bezel-Steel-Polished
Dial variants
- Silver Must Large — Black Roman numerals / Cartier signature / SWISS MADE at 7 o'clock
Crystal variants
- Saphir-Tank-Must-Large
Bracelet variants
- Schwarzes gekörntes Kalbsleder / Ardillon Stahl Ref. WSTA0109-Strap-Black-CalfSkin-Ardillon
Three codes pin down this reference beyond doubt: the dial marked "WSTA0109-Dial-Silver-Roman," the bezel marked "WSTA0109-Bezel-Steel-Polished," and beneath it Caliber 157, Cartier's in-house quartz movement. When someone brings me a steel Tank Must Large, these are the first three points I check. The silvered dial paired with Roman numerals is the standard configuration for this reference, not a rare variant — which is exactly what makes it so reliably identifiable in the trade.
## The Tank Must as an Entry Point, Not a Compromise
Cartier launched the Must line in 1977 to bring the Tank to buyers who didn't necessarily want gold on the wrist. The WSTA0109 carries that tradition forward: steel case, polished bezel, quartz-driven rather than mechanical. In the market it circulates under three names — "Tank Must Large Steel," "Must Large," and "Tank Must Quartz Large" — to me, all the same watch, just labeled differently depending on the dealer. Anyone looking for a Tank they can wear every day without thinking about winding it ends up at Caliber 157 almost by default.
## What I Check First When Buying
Polished steel bezels show wear faster than satin-finished surfaces, and that's simply built into the WSTA0109. I start by checking the bezel's facet edge for rounding, then the crispness of the Roman numerals' stamping on the silver dial. Together, those two checks tell me in under a minute whether a watch has been babied or worn daily. No production changes have been documented for this reference so far, which makes it considerably easier to place than older Tank references.
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 Must, Large Model, Quartz Movement, Steel, Le
Entry into Cartier
At $4,026 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.
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 Must, Large Model, Quartz Movement, Steel, Le 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 Must, Large Model, Quartz Movement, Steel, Le.
- 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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