Short answer
A replica Type XX 3820BR is a counterfeit of the Breguet Type XX Transatlantique in rose gold. The real watch is a 39 mm automatic flyback chronograph built around a Lemania-derived caliber, and it was made in small numbers. Because of that, no factory produces a true 1:1 copy the way they do for a Submariner. Most listings pair a generic chronograph movement with a decorated rotor, so the movement photo and the pusher feel tell you more than the caseback engraving.
What the reference number means
Breguet codes references with a case material suffix. BR stands for rose gold (or rose), BA for yellow gold, BB for white gold, ST for steel, TI for titanium. A watch sold as a 3820BR with a steel case, a titanium case, or no material code at all is not the object it claims to be. Get the full reference string in writing before you discuss price.
The genuine watch
The Type XX Transatlantique 3820BR has a 39 mm rose gold case, sapphire crystal, and a display back. Inside sits an automatic chronograph caliber with a flyback (retour en vol) function, descended from the Lemania ebauches Breguet used for decades. The dial is matte black with luminous Arabic numerals, Breguet signature script, and a Swiss Made line at the bottom edge. Rose gold examples were produced in far smaller numbers than the steel 3820ST, which is one reason replicas of this reference are both rare and poorly executed.
How to vet a replica Type XX 3820BR
- Request the full reference number and material suffix in writing before anything else.
- Ask for a straight-on photo of the caseback and a photo of the movement with the rotor turned away from the balance.
- Measure the case diameter. The genuine figure is 39 mm, and many fakes run 40 to 42 mm because the case is shared with a cheaper model.
- Read the dial print at 3x magnification. Look for thick serifs on the numerals and a Swiss Made line that sits too high or too low.
- Run the flyback. Start the chronograph, then press the lower pusher while the hand runs. A genuine caliber snaps to zero and restarts. A generic module often stalls or resets off center.
- Check where the chronograph seconds hand parks. Off-center reset at 12 is the most common flaw on these fakes.
- Inspect the pushers and crown. Genuine screw-down pushers have smooth threads and a short, firm throw.
- Look for gold hallmarks. Rose gold cases carry a fineness mark, usually 750, plus a maker mark. A plated replica shows laser engraving with no depth.
- Weigh the watch head and compare with the seller spec. Plated brass runs light; tungsten runs heavy.
- Compare the asking price with used-market listings for a real 3820BR. A price far below the used market means the watch is not real, whatever the listing says.
Red flags in listings
- Stock images or photos lifted from an auction archive.
- Swiss made claims with no movement photo.
- A steel case described as rose gold, or a caseback stamped 3820ST with a gold finish.
- Pressure to pay by wire or gift card, which removes your ability to dispute the charge.
- A seller who will not confirm the reference string in writing.
Legal and resale reality
Counterfeit watches are illegal to import and sell in the United States. Customs can seize a shipment, and selling a counterfeit while claiming it is genuine exposes the seller to civil liability. Resale value on a replica is effectively zero, and service is difficult because the internal parts do not interchange with the genuine caliber.