The fake Cartier Baignoire collection is a set of replica versions of Cartier's curved "bathtub" case, and the market sorts into three tiers: Japanese quartz builds, Swiss quartz builds, and super clone automatics. Case shapes copy the genuine Small, Mini, Allongée, and Débordante lines. Price tracks one thing above all others: how faithfully the case curves and how the cabochon crown is cut. A replica with a flat case and a plastic cabochon will read as fake from arm's length, no matter what the dial says.
Prerequisites
- A target reference. Pick one Baignoire size and shape before you shop, not after.
- Working knowledge of US trademark law. Counterfeit goods are illegal to import and to sell inside the United States.
- Tools: digital calipers, a 10x jeweler's loupe, a gram scale, a soft microfiber cloth.
- Reference photos of the genuine piece at the same angle you plan to inspect.
Why the Baignoire Shape Is Hard to Copy
A Baignoire case is not an oval and not a rectangle. It is an elongated curve that rises at the lugs and drops through the middle, so the profile looks like the rim of a bathtub when you view it from the side. That curve is the whole design. Budget replicas press a flat oval blank, polish it, and call it done. The result sits high on the wrist, catches light in one flat plane, and shows a hard shadow line where the genuine case rolls away.
The second hard part is the cabochon. Genuine pieces use a blue spinel or sapphire set into the crown, cut as a dome with a soft shoulder. Replicas substitute dyed glass, resin, or a low-dome stone with a sharp edge. Under a loupe, a real cabochon shows internal color gradation. A fake one looks like a bead.
Replica Tiers at a Glance
Japanese quartz tier
Miyota or equivalent quartz movements, mineral glass, stamped casebacks. Weight lands light and the case curve is shallow. This tier is the most common source of obvious tells.
Fake Cartier Baignoire Auction: How to Spot a Counterfeit
Swiss quartz tier
Sapphire crystal, better case finishing, correct dial printing size. The curve improves but often stays a touch flat at the lug tips. Screw-down casebacks appear here.
Super clone tier
Decorated automatic or high-grade Swiss quartz, matched case geometry, correct cabochon color, engraved hallmarks with the right depth. Weight sits closest to the genuine article.
How to Evaluate a Replica Baignoire Step by Step
- Measure the case width and length with calipers and write both numbers down.
- Compare your numbers against the published dimensions for the reference you chose.
- Set the watch on a flat surface and sight along the case from lug to lug.
- Confirm the case curves down through the middle instead of running flat.
- Inspect the crown cabochon with the 10x loupe and check for color gradation.
- Check that the cabochon sits flush with a rounded shoulder, not a sharp rim.
- Examine the dial printing at 10x for thick or bleeding Roman numerals.
- Look for the hidden signature worked into the VII numeral.
- Check hand finish. Blued steel shows a deep even tone; painted hands look flat.
- Turn the watch over and count the caseback screws, then check engraving depth.
- Time the movement for 24 hours and note the daily deviation.
- Flex the strap and operate the deployant clasp through ten open and close cycles.
- Weigh the complete watch on the gram scale and compare it to the reference figure.
- Place the watch beside your reference photo at the same angle and compare the case profile.
Common Tells on a Low-Tier Build
- Case sides that are mirror flat instead of curved.
- Cabochon that is round rather than domed, or the wrong shade of blue.
- Dial text that touches the inner track or sits off center.
- Caseback engraving that feels shallow and soft to a fingernail.
- Crystal with visible edge distortion and a purple tint.
- Strap stitching that is uneven at the lug ends.
Care and Use
Quartz replicas need a battery change every two to three years. Automatics need a service interval of about five years if you wear them often. Keep any Baignoire style case away from perfume, sunscreen, and chlorinated water, since the curve traps residue near the caseback gasket. Wipe the case with a dry microfiber cloth after each wear and store the watch flat in a case. Never assume water resistance, even when the caseback is screwed down.
Legal and Buying Notes
Cartier holds registered trademarks on the name, the dial layout, and the case shape. Selling a counterfeit as genuine is trademark infringement in the United States, and importing counterfeit goods can lead to seizure and civil liability. Buyers who treat a replica as a replica, disclose it as such on resale, and never present it as an authentic Cartier stay clear of the worst exposure. Verify your seller's return policy and payment terms before money changes hands, and pay in a form that leaves a traceable record.