A fake Breguet Marine Chronometer copies a watch that sells for $20,000 and up, but the copies go for a few hundred. The fastest tell is the dial. Real Breguet Marine dials have hand-turned guilloché, a pattern cut into the metal with a rose engine. Most replicas print or stamp a flat wave pattern. Under a loupe, the real thing has depth and crisp edges; the fake looks like a decal.

Dial and hands

Breguet hands have a hollow eccentric tip, often called a moon tip. Check the tip with a phone macro shot. Fakes usually have a solid tip or a blob that is too thick. The seconds subdial on the Marine is crisp, and the date window (on models that have one) sits at 3 or 4:30 depending on the reference. Wrong placement is common on replicas.

The logo is another giveaway. Genuine Breguet script is thin, even, and sharp. Replica logos are often too bold or crooked. Look at the space between the B and the reguet.

Movement

Genuine Marine watches use in-house calibres, and newer ones use silicon escapements and magnetic-resistant parts. You cannot see that from the outside. What you can check is the caseback. High-end fakes often use a Miyota or Seiko-based movement with a decorated rotor that says Breguet. The finishing is shallow. Real Breguet bridges have Geneva stripes, polished bevels, and engraved serial numbers that match the case.

Case and bracelet

The Marine case band is fluted, with a coin-edge profile that catches light. Replicas machine this in one pass, so the grooves are shallow and lack the crisp edge. Lugs on the genuine watch are welded, not stamped, and the caseback screws line up. On fakes, the screws often sit at odd angles.

Weight and feel

A steel Marine 5517 weighs around 120 grams on the bracelet. Most fakes are lighter, sometimes 80 to 90 grams, because the case is thinner and the bracelet is hollow. The crown should turn with a smooth click. If it grinds or feels loose, that is a sign.

Price and legal reality

If a Breguet Marine is listed under $1,000, it is a replica. No gray-market dealer sells a real one that cheap. In the US, trafficking counterfeit goods is a federal crime under 18 U.S.C. 2320, and customs seizes shipments. I would treat any offer as a fake unless it comes with box, papers, and a service history from an authorized dealer.