Short answer
830107 is not a Cartier reference number. It does not match any code Cartier publishes for the Tank line. Listings that use 830107 treat it as a seller stock number, an internal code that identifies the listing, not the watch. The word new in the same line describes condition. Neither term tells you who made the case, the dial or the movement.
How Cartier numbers a Tank
Cartier prints reference numbers on the caseback. Current references use a W followed by six digits, such as W5200013 for a Tank Solo in steel. Older pieces use shorter codes that vary by decade. Cartier lists current models and their references on its own site. If a number returns no result there, it is not an official reference.
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Why sellers reuse codes
Sellers assign stock codes to manage inventory across colors, sizes and case materials. One code can cover several pieces. A code that appears under two different Tank shapes, or under a Tank and another brand, comes from the seller, not from Cartier. A buyer who searches the code finds the listing again and nothing else.
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Legal status in the United States
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. 2320. A first offense carries up to 10 years in prison. Goods that carry a counterfeit mark are subject to seizure at import under 19 U.S.C. 1526, and CBP seizes counterfeit watches at U.S. ports. A trademark owner can also sue under the Lanham Act, with statutory damages up to $2,000,000 per mark per type of goods in a willful case.
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Checks before you pay
- Search the caseback reference on Cartier's site. No match means the number is not an official reference.
- Compare the caseback engraving: font, depth, spacing and placement.
- Ask for the serial number and any service record.
- Ask which movement is inside. Cartier Tanks use Cartier calibers, so the reply should name one.
- Compare the asking price with Cartier retail for a steel Tank. A large gap points to a counterfeit.
What the code cannot tell you
830107 gives no data on age, movement, case material or origin. Photos in a listing can be borrowed from other sellers. For any Tank purchase, the caseback reference and the serial number carry the information that matters.