No counterfeit Cartier Santos, whatever the listing calls it, arrives with a Cartier service record or a Cartier warranty, and that single gap settles most authenticity questions before you ever open the case. If you are searching the reference string 162351, you are most likely reading a resale listing or holding a watch you already bought, and the real question is whether the piece is genuine. The checks below run in the order a watchmaker would perform them, from the outside in.
What the string 162351 does not tell you
Cartier has used several reference formats across the Santos line, and resale titles mix case numbers, movement numbers and dealer codes into one string. A number in a listing is a claim, not proof. Treat it as a starting point, then verify it against the engraving on the back of the case and the paperwork that shipped with the watch. If the seller cannot explain where the number appears on the actual piece, stop there.
Caseback engraving and markings
On a genuine Cartier, the engraving sits at an even depth, with consistent spacing and letterforms that match the era of the watch. Replica engraving tends to show shallow or wandering lines, uneven spacing, or a font that is close but not correct. The reference and serial should be consistent with each other and with the model generation. A polished caseback that looks too smooth around the lettering is a warning sign, since polishing erases detail and counterfeiters often start from a softly finished blank.
Movement, crystal and case finishing
Only a qualified watchmaker with the case open can confirm the movement, and that step is worth the fee on any five-figure purchase. Genuine Santos watches use movements specified or branded by Cartier; replicas substitute generic movements that may fit the case but do not match the original. Check the crystal for the correct profile and for distortion at the edges. On the case, polished and brushed surfaces should meet at crisp, straight lines. Bracelet screws and bezel screws should be uniform in size and finish; a mix of mismatched or misaligned screws points to a copy.
Dial, hands and printing
Magnification is the honest test. Genuine dial printing is sharp, with clean edges and correct font weight. Replica dials show slightly heavy or bleeding print, wrong serif shapes on the Cartier signature, date wheels with the wrong numeral font, and lume plots that sit at uneven heights. Hands should have the correct shape and finish for the reference, with no tool marks at the pinion.
Box, papers and service history
Boxes and warranty cards are counterfeited too, so they support a genuine watch rather than proving one. What carries weight is a service invoice from an authorized Cartier center or a reputable independent watchmaker, with a case number that matches the watch in front of you. Ask for the original purchase receipt, the warranty card with matching serial, and any service records. A seller who has none of these but insists the watch is genuine is asking you to accept risk you cannot price.
Two ways to get the look
Genuine pre-owned Cartier Santos
- Pros: can be authenticated and serviced, retains resale value, is insurable, and comes with legitimate parts support.
- Cons: higher entry price, may need a service soon after purchase, and availability varies by reference and condition.
Replica or super clone
- Pros: a much lower purchase price, and at arm's length it may resemble a Santos.
- Cons: illegal to sell and to import into the United States, no warranty, no Cartier service, near-zero resale value, risk of seizure in transit, and no recourse if it fails.
The recommendation is straightforward. If you want a Santos on the wrist, buy a genuine pre-owned example from a dealer with a written return window, then have it authenticated by a watchmaker before that window closes. If the budget does not reach a Santos, look at an entry-level Cartier or a well-documented vintage piece instead of a copy. Paying for a counterfeit means paying once for the watch and again when it cannot be repaired, sold or serviced.
The legal reality
Counterfeiting is a trademark offense in the United States, and both selling and importing counterfeit watches carry civil and criminal exposure. Buyers are not shielded either: customs can seize the shipment, no court will help you recover a defective replica, and no authorized service center will touch it. That is the practical cost behind the low sticker price.