The short answer
A fake Breguet 5207 is a replica of the Breguet Classique 5207, a solid gold perpetual calendar dress watch. The replica almost never reproduces that movement. What you actually get is a case and a dial built to look right from a few feet away, with an ordinary Chinese automatic or quartz caliber underneath and a calendar you must reset by hand every time a month runs short of 31 days. Think of it as costume jewelry that happens to tell time, not as a watch that behaves like the original.
What the genuine 5207 is
The Classique family is Breguet's dress watch line, and the 5207 sits close to the top of it. The real piece is a perpetual calendar with day, date, month, leap year, and usually a moon phase, all driven by a mechanical movement built to track 28, 30, and 31-day months plus February 29 every fourth year. Case diameter is in the high 30s in millimeters, in 18k yellow, white, or rose gold. The dial is silvered gold with hand-cut guilloché, Roman numerals, and blued steel Breguet hands. Genuine examples run well into six figures at retail.
Why this reference is so hard to copy
Perpetual calendar mechanisms are the most demanding thing in watchmaking to produce cheaply. A working one needs a program wheel, levers, and a jumping mechanism that stay in sync for decades. A replica shop can turn out a convincing case in a week. It cannot turn out that movement at any price a buyer would actually pay. So the replica trade picks one of three shortcuts:
- A simple calendar inside the case, with the subdials serving as decoration.
- A 24-hour disc used as a day/night indicator and labeled as something grander.
- A quartz or basic automatic movement where the moon phase is printed, not driven.
Where the tells show up
I look at the dial first. Real guilloché has depth and shifts under light because the pattern is cut into metal. Most replicas print it, so it sits flat and disappears at an angle. Next is the printing itself: the Breguet signature on a real dial is crisp at loupe magnification, while replicas smear or thicken at the serifs. Then the calendar. Set the watch to February 28 and watch what it does on March 1. If the date does not roll to 1, the "perpetual" claim is marketing.
Other checks worth doing: the weight of the case in hand, since gold has heft that gold plating over brass does not; the caseback engraving, which on genuine pieces is deep and even; the crown action, which should feel machined rather than gritty; and the crystal, which should be sapphire and should not pick up a scratch from a key in your pocket.
Price and value reality
The math is lopsided in a way that should tell you something. A top-tier replica of a 5207 sells for a few hundred dollars. The watch it imitates trades for more than most American homes are worth. That gap is not efficiency. It is the cost of skipping the movement, the hand finishing, and the decades of engineering. Resale value on a fake is zero, and no watchmaker will service one beyond a battery or a basic regulation.
Legal and practical notes
In the United States, selling counterfeit goods carries real exposure under trademark law, and shipments coming through customs get seized and destroyed. Personal possession is a grayer area, but importing is not, so the package is the risk. If a seller promises a working perpetual calendar in a gold case for a few hundred dollars, one of those three words is false.