Short answer

A replica Tourbograph 510.105 gives you the silhouette of an A. Lange & Söhne Tourbograph Pour le Mérite, not the mechanics behind it. Nearly every one sold online is a Chinese movement dropped into a polished case, priced from about $280 to $900 depending on whether the tourbillon cage actually rotates. The fusée-and-chain drive, the rattrapante chronograph and the hand-engraved balance cock are not reproduced at any price. If a listing promises those three things, the listing is fiction.

What the real watch does, so you know what's missing

Lange built the Tourbograph around complications that are painful to combine. A one-minute tourbillon sits in a cage that turns once every sixty seconds. A fusée-and-chain transmission evens out the torque as the mainspring unwinds. A rattrapante chronograph carries two seconds hands so you can split a segment and let the second hand catch back up to the running total.

The chain alone is several hundred parts assembled by hand. No factory in the replica supply chain makes one, and no seller in this price range has ever shipped one. The split-seconds side is the same story: a true rattrapante needs a second column wheel plus an isolation mechanism for the split hand. On replicas with two pushers, one runs the chronograph and the other one is decorative or resets the hand you already reset.

The three tiers you will run into

  1. Under $200. Usually quartz or a basic automatic. The tourbillon aperture is a printed bridge, or an open balance wheel dressed up to look like a cage. Subdials are often day and date functions wearing chronograph labels.
  2. $250 to $450. A decorated automatic, sometimes a 2824 clone. Finishing looks decent in photos and flat in your hand. The caseback is where the money went, not the dial.
  3. $600 to $1,200. This is where a genuine Chinese tourbillon shows up, from Hangzhou or Seagull. Hand-wound, 40 to 60 hours of reserve, cage turning once a minute. Still no fusée, still no split-seconds, but the aperture does something real.

How I screen a listing

  • Ask for a live video instead of stock photos. Have the seller put a phone next to the watch and film the tourbillon aperture for a full sixty seconds.
  • Time one rotation. A real one-minute tourbillon finishes one turn per minute. A printed bridge or a bare balance wheel never moves at all.
  • Compare the dial layout against a genuine photograph, not against another replica. Subdial positions drift between batches and between factories.
  • Ask directly what the movement is. A straight answer sounds like a caliber number. A vague answer sounds like "top grade Swiss."
  • Look for a rotor in the caseback shots. Plenty of tourbillon replicas are hand-wound, and a cosmetic rotor glued over one becomes obvious in motion.
  • Request measured case size, thickness and weight. Replicas run thick, and a 2 mm difference is visible on the wrist.

Red flags

  • "Swiss made" on a tourbillon under $500.
  • Two pushers plus a claim that the split-seconds function works.
  • No video, no movement photo, no measurements, only pressure to buy.
  • Payment methods with no chargeback path.
  • A price that jumps when you ask for proof the watch exists.

Legal side, in the US

Counterfeit watches are illegal to import. U.S. Customs and Border Protection can seize a package, and the seizure letter arrives at your address, not the seller's. Trademark owners record their marks with the agency, which is how most watches get pulled in the first place. A single watch for personal use carries less attention than a stack of them, but it is not legal either way. Buying from overseas also means no recourse when a package never lands, since the payment routes these sellers prefer rarely allow a chargeback.

Checklist before you pay

  1. Live video of the tourbillon cage completing one full turn.
  2. Movement name, confirmed in writing.
  3. Measured case diameter, thickness and lug width.
  4. Photos of the actual watch, not catalog renders.
  5. A payment method where you can dispute a charge.
  6. A clear answer on who refunds you if customs holds the parcel.

Bottom line

Treat 510.105 as a reference number that describes a look. Judge what you are buying by the movement in the video and the measurements in the reply. A $700 replica with a working Chinese tourbillon is honest about what it is; a $300 replica claiming fusée-and-chain and split-seconds is a costume. Decide which one you are actually shopping for before you send money.