Answer first: verify the case generation before anything else
The one thing that separates a passable replica Cartier Tank 2370 from a wasted purchase is whether the seller matched the correct case generation. Two watches sold under the same name can differ by three millimeters of width, a different crown profile, a rewritten Roman numeral layout, and a bracelet that tapers at the wrong rate. Before you discuss movement or finish, ask for a straight-on dial photo, a caseback photo with the stamping legible, and a side profile with a ruler or calipers in frame. If those images do not line up with the reference you agreed on, stop there. Proportions cannot be corrected after the fact, and they are the first thing a person who knows the model will notice.
Treat the purchase as a novelty, not an asset. A replica is not a Cartier, carries no warranty from Cartier, cannot be serviced by Cartier, and may be seized in transit. Decide that you are comfortable with those terms before you send money.
What the 2370 number does and does not tell you
Reference numbers get used loosely in the replica market. Sellers apply 2370 as shorthand for a mid-size steel Tank, but Cartier's own numbering runs across model lines and production generations, so the number alone will not tell you the case width, the dial variant, or the movement inside. Ask the seller to state the case width in millimeters, the thickness, the lug width, and the crystal material in writing. A seller who answers those four questions with numbers is a better sign than any photo of a box.
What to inspect, in order of importance
Case and proportions
- Case width and length should match the generation you asked for, measured edge to edge and not including the crown.
- Thickness matters more than people expect. A quartz build usually lands thinner than an automatic, and a case that looks slab-sided in profile is a common tell.
- Brancards and lugs should be symmetric. Sight down the case from the 12 o'clock side and check that the lugs sit level.
- Brushed surfaces should run in one direction, with polished bevels that are crisp rather than rounded off.
Dial printing and hands
- Roman numerals should be sharp at the corners. Fuzzy or filled-in corners are the most visible failure on a Tank dial.
- Track lines and minute marks should be even in weight and evenly spaced. Count the gaps.
- Blued hands should read dark blue at an angle and almost black straight on. Painted blue looks flat under any light.
- Print should sit on top of the dial surface, not sink into it.
Crown and cabochon
The crown on a Tank is a focal point. A synthetic blue spinel cabochon should be domed, set straight, and free of bubbles or a visible glue line. The crown itself should be milled, not cast, and should turn with light resistance. A crooked or cloudy cabochon is hard to fix and easy to spot.
Crystal
Many listings claim sapphire when the watch ships with mineral glass. Ask for the material in writing, then check the edge of the glass under a light. Sapphire has a sharper, cleaner edge and stays cooler to the touch for longer. A water drop test is a rough field check, not proof.
Movement
Quartz and mechanical builds both exist under this name. Quartz is simpler, thinner, and cheaper to replace. A mechanical movement in a replica is rarely serviceable by an independent watchmaker because parts are not stocked, so treat a mechanical copy as disposable. Ask which movement family is installed and whether the seconds hand sweeps or ticks, since that single answer resolves most of the confusion.
Bracelet or strap
Check the clasp stamping, the taper, and the end link fit. Gaps between the case and the end link are common on budget builds. On leather, look at the stitching density and the inner lining, not just the outer grain.
Parameter bands worth asking about
- Case width: roughly 25 mm to 31 mm across Tank variants. Confirm the exact figure for the reference you want.
- Thickness: about 6 mm to 8 mm for quartz, 8 mm to 9.5 mm for mechanical.
- Lug or end link width: about 15 mm to 18 mm depending on the case size.
- Weight on a steel bracelet: roughly 60 g to 95 g. A watch that feels hollow usually is.
- Water resistance: any claim above splash resistance needs a stated standard. Ratings for watches are defined by ISO 22810, which requires testing, so an unmarked number on a listing is marketing copy.
Pitfalls that cost people money
- Buying from QC photos that are cropped, blurred, or borrowed from another listing. Ask for a dated photo of the actual unit.
- Accepting tier language such as mirror grade or 1:1 as a substitute for specifications. These words have no fixed meaning.
- Paying through an irreversible channel with no written return terms. Confirm the return window and who pays return shipping before payment.
- Ignoring customs risk. Counterfeit goods are subject to seizure, and a seizure means the money is gone with no recourse.
- Assuming a jeweler will service it. Most will not touch a replica, and parts availability is close to zero.
- Paying extra for packaging. A box does not improve the watch and adds bulk that invites inspection.
FAQ
Is a higher price a reliable sign of quality?
No. Price tracks seller overhead as much as build quality. Judge the four numbers, the photos, and the return terms instead.
Can I wear it swimming?
Assume no. Gaskets on replica cases are rarely tested, and a claimed depth rating without a standard behind it means nothing.
Will it fool an expert?
Not at close range under good light. Case proportions, dial print, and the crown give it away to anyone who handles the real model. Buy it because you like how it looks, not because you plan to pass it off.
What is the biggest single tell?
Case thickness and dial print quality, in that order. Both are visible in a normal conversation without anyone asking to hold the watch.
Is buying one legal?
Rules vary by country, and importing counterfeit trademarked goods is restricted in the US. Selling counterfeit goods bearing a registered mark can violate trademark law, and shipments can be seized. Check your local rules before you order.