The short answer: a replica Breguet tourbillon perpetual calendar is a Chinese-made watch built to mimic Breguet's grand complication pieces at a fraction of the price. Budget roughly $250 to $1,500 depending on tier. On the better versions the tourbillon cage is a working, visible rotating carriage. On cheap ones it is a spinning disc with a fake bridge. The calendar is almost always a triple-date or day-date-month module with a moonphase, not a true perpetual calendar that tracks leap years. Real perpetual calendar copies exist, but they are rare, fragile, and priced well above the usual replica market.

Why this combination is harder to fake than a Submariner

A tourbillon is a regulating device that puts the balance wheel and escapement inside a rotating cage to average out positional error. Abraham-Louis Breguet patented it in 1801, so the name carries real history. A perpetual calendar is a gear train that knows February has 28 or 29 days and adjusts for leap years. Stacking both in one watch means two separate mechanical systems sharing one case. Replica factories handle each one well enough on its own. Combining them at a low price forces compromises, and the compromise is usually the calendar.

The three tiers you will run into

• Under $300: decorative tourbillon, quartz or basic automatic, printed moonphase that never moves, calendar pushers that click but change nothing.
• $300 to $700: real Chinese tourbillon movement (Seagull or Hangzhou based), working day/date/month, moonphase driven off the hour wheel. This is the sweet spot for looks.
• $800 and up: cloned or highly modified movements, hand-finished bridges, sapphire front and back, guilloche-textured dials. The calendar is still usually annual at best, not perpetual.

What I check before anything else

Open the caseback photo and look at the cage. A real tourbillon has a visible balance wheel inside the rotating carriage, and the whole assembly turns once per minute. If the bridge is solid and the balance sits outside the cage, it is theater. Then check the calendar pushers: recessed correctors on the side of the case are a good sign, plain buttons are not. Ask for a video with the seconds hand running and the moonphase at two different times of day. If the seller cannot produce that, walk away.

The Breguet look matters more than the spec sheet

Breguet's design language is specific: fluted caseband, welded lugs, a guilloche dial, blued pomme hands, and the secret signature. Replica makers get the caseband right more often than the dial texture. Look for a dial that catches light in a pattern rather than a flat print. Case size on the originals runs 38 to 41 mm, and replicas that push to 43 mm look wrong on the wrist no matter how good the finishing is.

Practical and legal notes

Counterfeit watches are illegal to import and sell in the United States, and U.S. Customs seizes them routinely. A replica is also not a Breguet for service purposes: no authorized watchmaker will touch it, and parts come from the same gray market that sold you the watch. If the calendar module fails, repair often costs more than the watch. Treat the purchase as a disposable novelty and the math works. Treat it as an investment and it does not.

Bottom line

If you want the tourbillon spectacle and a convincing Breguet dial, the mid tier delivers it. If you want a functioning perpetual calendar, save for a watch with a documented annual or perpetual module from a known maker. No replica at $400 is going to know about February 29 in 2028.