Short answer
A replica Datograph 410.031 is a copy of an A. Lange & Söhne Datograph. It is not made by Lange. Prices for these copies run from about $150 to $900. No replica in that range holds a Lange calibre. Most use a Chinese chronograph movement or a quartz module behind a decorated plate. The genuine watch sells used for $40,000 and up.
What the reference number covers
Lange groups Datograph variants under several 410.xxx and 405.xxx numbers. Case metal, dial color, and calendar layout change with each number. Replica sellers use 410.031 as a label for a platinum-look Datograph with a black dial and an outsize date. I cannot confirm from public listings that every 410.031 copy matches the genuine variant. Ask the seller for photos of the caseback and the movement before you pay. Many listings apply the number to watches that do not match.
Genuine specs
- Maker: A. Lange & Söhne, Glashütte, Germany
- Movement: hand-wound, column wheel, horizontal clutch, flyback chronograph
- Dial: two subdials, outsize date, tachymeter scale on some versions
- Case metal: platinum on most 410.xxx numbers
- Case size: 39 mm to 41 mm, by generation
- Finish: hand-engraved balance cock, screwed gold chatons, blued screws
What the copies contain
At $150 to $300, most copies use a quartz movement. The pushers do not drive a real chronograph on many of them. At $400 to $900, sellers list a Chinese automatic chronograph, often a Seagull ST19 or a 7750 clone. The subdials may work. The perpetual calendar, moonphase, and outsize date on these watches are cosmetic in most cases. Date windows can be printed or run by one disc.
Tells on the wrist and on the bench
- Weight: platinum is dense. A steel or brass case feels light in the hand.
- Balance cock: genuine engraving is cut by hand and differs on each watch. Copies use a stamped or laser pattern that repeats.
- Outsize date: the genuine watch uses two discs and a crossbar. Copies use one disc or a printed window.
- Subdials: copies sit closer to the center and use flat hands.
- Caseback text: font, spacing, and cut depth differ from photos of the genuine watch.
- Crystal: the genuine sapphire shows a blue tint at an angle. Many copies show none.
Price and risk
Prices cluster at $150 to $300 for quartz and $400 to $900 for automatic copies. Sellers who advertise "Swiss made" replicas are mislabeling Chinese product. There are no Swiss factories that build Lange copies. Expect no warranty, no spare parts, and water resistance that is not tested. Service is hard. Watchmakers do not stock parts for these movements.
Legal status in the US
US law treats counterfeit watches as illegal merchandise. Under 18 U.S.C. § 2320, trafficking in counterfeit goods carries fines and prison time. US Customs and Border Protection can seize shipments. A personal-use purchase does not make the item legal to import. Lange holds the trademark and the design rights.
Before you buy
Ask for a movement photo, a caseback photo, and the weight in grams. Ask for the return policy in writing. Compare the photos with the genuine reference on the Lange site. If the seller cannot name the movement, the answer is no.