Short answer
Reference 510.105 does not appear in A. Lange & Söhne catalogs for the Tourbograph line, as far as public records show. The manufacturer lists the Tourbograph Perpetual "Pour le Mérite" under the 706 series. Sellers use "510.105" as a listing code for a replica of that watch. Treat the number as a seller label, not a factory reference.
What the genuine watch is
The Tourbograph pairs a tourbillon with a chronograph. The 2005 version added a fusee and chain transmission and carried the "Pour le Mérite" name. The 2017 version added a perpetual calendar. Lange builds the movement in-house and finishes parts by hand. The platinum version is listed at 43 mm across. Honeygold is Lange's own gold alloy. The 2017 platinum run was 50 pieces.
What replica listings show
- Case size: 42 mm to 44 mm, stainless steel or plated base metal.
- Crystal: sapphire on higher tiers, mineral glass on low tiers.
- Dial: printed subdials, applied markers, a tourbillon opening at 6 o'clock.
- Movement: Chinese automatic or hand-wind, often a Hangzhou or Seagull tourbillon.
- Strap: alligator-grain leather, rarely real alligator.
Movement: where the gap sits
A genuine Tourbograph movement runs a chain over a fusee cone to even out torque. Replicas do not include that system. Most replica listings use an off-the-shelf Chinese tourbillon. A few add a chronograph module on top. Service intervals are shorter, and parts are hard to source. Ask the seller for the movement name and a photo of the bridge layout.
Price bands
Replica listings run about $250 to $1,200. Tourbillon versions sit at the top of that range. Quartz and non-tourbillon versions sit near the bottom. Genuine examples trade for several hundred thousand US dollars at auction and on the secondary market.
Ultimate Guide to the Tourbograph 510.105 Watch Copy
Checks before buying
- Ask for a video of the tourbillon cage turning.
- Confirm the chronograph starts, stops, and resets to zero.
- Compare case back engraving against factory photos.
- Request movement photos, not stock images.
- Get the return window in writing.
- Confirm the stated case size, since listings round numbers.
Legal note
A replica carries the Lange name and logo. Sale of such goods is restricted in the US and the EU. Some sellers ship unbranded versions with blank dials and case backs.