Quick answer
8240029 is not a Cartier catalog model name. It is a numeric reference that appears on service paperwork, dealer inventory tags, and aftermarket listings tied to the Cartier Tank line, most often stainless steel Tank Solo and Tank Must quartz pieces. When a seller advertises a "replica Cartier Tank 8240029," they are selling an unauthored copy of a Tank watch, not a Cartier product. No replica carries Cartier's warranty, service history, or resale value. In the United States, importing, selling, or distributing counterfeit watches is illegal under the Lanham Act and 18 U.S.C. 2320, and shipments can be seized by Customs and Border Protection.
Prerequisites
- The exact reference number from the listing, including any suffix letters
- The seller's stated case size, movement type, and materials
- A payment method with chargeback rights
How to vet a listing that uses this reference
- Write down the full reference string, because 8240029 alone does not identify a case size, a dial color, or a movement.
- Look up the genuine Tank dimensions on Cartier's own collection pages and compare them to the seller's stated millimeters.
- Ask the seller which movement powers the watch and whether it is quartz or mechanical.
- Request a close photo of the caseback engraving and the crown, since font spacing and stamp depth are the first details copies get wrong.
- Check whether the seller lists a return window in writing and honors refunds before shipment.
- Confirm the seller's shipping origin, because counterfeit parcels entering the US are screened and can be destroyed without compensation.
- Read the payment terms, since wire transfers and gift cards remove your ability to dispute a bad order.
- Budget for service, because replica movements are rarely repairable by independent watchmakers and parts are not stocked.
What the number usually points to
Dealers use short numeric codes to track cases, straps, and service jobs. A code like 8240029 is an internal identifier, which is why the same string turns up on unrelated listings with different dials and sizes. Treat any listing that leans on a bare number as a signal that the seller has no genuine documentation to show.
Legal exposure in the US
Selling counterfeit goods carries civil liability to the trademark owner and criminal penalties for repeat or commercial-scale trafficking. Buyers are not usually prosecuted, but seized parcels are lost money. Buying a genuine pre-owned Tank avoids both problems and holds value.
If you want the real thing
Cartier boutiques and authorized dealers sell the Tank with a full warranty. Pre-owned examples trade below retail through established auction houses and certified resellers, and every one of them can be authenticated by serial number.