Short answer
A fake Tourbograph Perpetual Calendar is a lookalike of the A. Lange & Söhne Tourbograph Perpetual "Pour le Mérite", a platinum limited edition of 50 pieces. No replica reproduces its calibre L133.1, its fusée-and-chain drive, or its rattrapante chronograph. What you can find is a cosmetic copy, built on a generic movement with calendar modules stacked on top. Judge it as a decorative object, not as a watch that performs the way the original does. Any seller who claims otherwise is a red flag.
What the genuine watch is
The original, released by A. Lange & Söhne in 2017, combines four complications: a one-minute tourbillon, a rattrapante double chronograph, a perpetual calendar, and a moonphase, all driven through the brand's fusée-and-chain transmission. The movement is calibre L133.1 with 684 parts. Production was capped at 50 pieces in platinum. That combination is why a faithful copy does not exist at any price. The chain drive alone is a miniature engineering project.
How to assess a Tourbograph Perpetual replica
- Measure the case and compare the numbers to the published dimensions of the platinum reference, then check the thickness. Copies of complicated watches run thicker than the original because the calendar module sits above the base movement.
- Weigh the watch in your hand and check the metal. Platinum is dense, so the genuine piece feels heavy for its size. Steel or plated brass copies feel light and show a warmer tint in daylight.
- Inspect the dial under 10x magnification. Study the edge of the printed text, the alignment of the calendar windows, and the finish on the applied markers. Fuzzy print and off-center window frames are the most common faults.
- Work the chronograph pushers. Press start, stop, and reset in sequence, then check for a rattrapante pusher near 8 or 10 o'clock. A split-seconds hand must stop on its own while the main chronograph hand keeps running. Most copies freeze the hand in place.
- Test the calendar the way a perpetual calendar is meant to work. Set the watch to February 28 in a non-leap year and advance the date. A true perpetual calendar rolls to March 1 on its own, a stacked module does not.
- Advance the moonphase through a full cycle and compare it to a known lunar date. Copies often use a 29.5-day disc with sloppy gearing that drifts within months.
- Turn the watch over and ask for a clear photo of the movement before you buy. Look for a free-sprung balance, blued screws, hand-engraved bridges, and gold chatons. A decorated rotor or a printed plate over a basic automatic movement is the tell.
- Check any engraving on the caseback and movement. Limited-edition numbering on the original is crisp and consistent. On copies it is stamped, uneven, or left generic.
Details copies get wrong
- Fusée-and-chain transmission: absent in every replica. You see a plain mainspring barrel instead.
- Tourbillon cage: many copies use an open aperture with a spinning disc that is decoration, not a regulating tourbillon.
- Rattrapante mechanism: cosmetic in nearly all cases. The split hand does not run on its own.
- Perpetual calendar: typically an annual or simple calendar module that needs correction at the end of February.
- Finishing: the genuine article is hand-finished on surfaces you cannot see. Copies stop at the surfaces you can.
Listing red flags
- A price far below the market for the genuine reference, with no explanation.
- Phrases such as "1:1", "Swiss clone", or "same as original" attached to a complication this rare.
- Photos of a genuine watch used as the listing image, with no photo of the actual piece.
- A refusal to show the movement or to send a video of the calendar and chronograph working.
Legal and practical note
Counterfeit branded watches are illegal to import and sell in the United States, and passing a replica off as genuine is fraud. If you buy a copy for personal use, know that you are buying a costume piece. If you believe you are buying a genuine Tourbograph Perpetual, deal only with a seller who provides movement photos, service records, and provenance, and have the watch authenticated before money changes hands.