Short answer
A falsified Breguet Tourbillon 3358 fails in three places: the tourbillon cage, the dial, and the caseback stamps. Check those first. A fake usually shows a cage with machined edges, a dial with stamped guilloche, and stamps that are too deep or too even. One failure is enough to stop the sale.
What reference 3358 is
Reference 3358 sits in the Breguet Classique line. It is a manual-wind tourbillon with the cage at 6 o'clock and a small seconds hand on the cage arbor. Breguet's tourbillon patent dates to 1801, 7 Messidor An IX on the French republican calendar. Public records on 3358 production counts and metal runs are thin. Confirm case metal, year, and movement number with Breguet before you pay.
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The cage
The cage turns once per minute and carries the balance. On a genuine 3358 the cage bridge has hand-beveled edges, polished steel, and a mirror finish along the bevel. Jewels sit in gold chatons. Screw slots are polished and aligned. On a counterfeit the bridge is often milled, the bevel is rounded or absent, and jewels sit in bare brass holes. Some fakes use a rotating disc that does not carry the balance. Watch the cage for 60 seconds and confirm the balance travels with it.
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The dial
Genuine 3358 dials are gold with hand-turned guilloche. The pattern is cut on a rose engine. Lines are continuous and the spacing shifts in a regular way. Stamped guilloche looks uniform and shallow, and the pattern often fades at the edges. Breguet puts a hidden signature in the guilloche. It is small and hard to find. Most fakes do not attempt it. Numerals on a genuine dial are printed or applied with sharp edges. Blued steel hands are hollowed and reach the chapter ring. Painted hands and short hands are a fake sign.
The case and caseback
- Reference and serial numbers are stamped between the lugs. The font is thin and even.
- Gold hallmarks: Swiss St. Bernard head, 750 stamp, and the case maker's mark.
- Caseback engraving is crisp. Cut letters have flat tops and sharp corners.
- Weight: gold cases feel heavy for the size. Steel fakes with gold plate feel light.
Laser engraving looks soft under a 10x loupe. Hand engraving leaves a burr at the end of each cut.
The movement
Bridges carry Cotes de Geneve, the mainplate carries perlage, and screws are blued. Engraving on the barrel bridge matches Breguet's house font. Fakes show stamped stripes, painted screws, and text in a different typeface. Beat rate is a fast check. A timegrapher reads amplitude, rate, and beat error in seconds. Many counterfeit tourbillons run at 21,600 vph. Confirm the correct rate for the caliber with Breguet, then measure.
Price and paperwork
Genuine 3358 examples sell in the high five figures to low six figures at auction. A seller asking a few thousand dollars for a "new old stock" 3358 is not selling a Breguet. Ask for the original certificate, the service record, and the Breguet archive extract. Call Breguet with the movement number. A watch with no paper trail and no archive match is a pass.
Checks in order
- Cage bevel and jewel chatons.
- Guilloche spacing and hidden signature.
- Serial and reference stamps between the lugs.
- Movement finish under 10x magnification.
- Beat rate on a timegrapher.
- Archive extract from Breguet.