Quick answer
A Cartier Santos Large listing is fraudulent when the reference number, serial number, case measurements, and paperwork do not match Cartier's own records for that model. Most fraudulent offers fall into three groups: a replica sold as genuine, a genuine watch that was reported stolen, or a watch that does not exist until you send a deposit. You can screen all three with the same five checks: reference number, caseback engraving, serial verification, movement or in-person inspection, and payment method.
Before you start
- The exact reference number the seller claims, for example WSSA0018 for the steel Large model.
- Photos of the front, caseback, crown, clasp, and any paperwork.
- A loupe or a phone camera with macro mode, and a caliper if you plan to measure the case.
- Access to a Cartier boutique or an independent watchmaker who services Cartier.
Steps to verify a Santos Large
- Ask for the reference number in writing before you discuss price.
- Request a sharp photo of the caseback, where the reference and serial numbers are engraved.
- Compare the reference against Cartier's published data for the Santos de Cartier Large, including dial color, case metal, and bracelet type.
- Call a Cartier boutique or authorized service center and give them the serial number for a status check.
- Measure the case if it is in your hand. The Large is about 39.8 mm wide and 9.4 mm thick, and replica cases often run a full millimeter thicker.
- Inspect the crown. It should be fluted with a blue cabochon set into the metal, not a flat blue disc glued on top.
- Check the dial under magnification. The Cartier script, the Swiss Made line, and the secret signature inside the VII numeral should be crisp and consistent.
- Examine the bracelet for SmartLink sizing and the QuickSwitch release at the lugs. Replicas often skip the release mechanism or make it stiff.
- Match the warranty card and invoice to the watch. The card should carry the same serial, a purchase date, and a boutique stamp.
- Have the watch authenticated in person before money changes hands. Use an authorized dealer or an independent watchmaker, never a person the seller brings along.
- Pay with a credit card or a platform that offers buyer protection. Refuse wire transfers, gift cards, and crypto.
Red flags in a fraudulent listing
- Price far below the current market for that reference, especially with a brand new, full set claim.
- Stock photos only, or photos where the serial number is blurred or cropped out.
- A seller who refuses a caseback photo or an in-person inspection.
- Pressure to pay today, or a story about a divorce, an estate, or a deployment.
- A reference number that does not match the dial color, case metal, or bracelet in the photos.
- Payment requested by wire, crypto, or gift card, or a push to move the deal off the platform.
- Papers that look laser printed, with a misspelled model name or the wrong case size.
If you already paid
- Stop all further payments and do not send the balance.
- Dispute the charge with your card issuer or the marketplace within the stated window.
- Save every message, photo, and receipt.
- File a report with the FBI Internet Crime Complaint Center and the FTC.
- Report the listing to the platform and, in the US, to U.S. Customs if the watch shipped from abroad.
Why this matters for replica buyers
If you shop replica watches, the same checks protect you. A 1:1 Santos Large sold with a cloned box and a copied warranty card is still a replica, and a seller who calls it genuine is committing fraud. Know what you are buying before you pay, and treat any offer that hides the reference number or the serial as a hard no.