Short answer
A replica Zeitwerk Date is a Chinese-built copy of the A. Lange & Söhne Zeitwerk Date. The genuine watch shows hours and minutes as jumping digits and adds a date ring at the edge of the dial. Replicas exist. None on the open market reproduces the genuine movement. Buyers get the layout: two digit windows, the date ring, the case shape, the signed crown. They do not get the constant-force escapement, the hand finishing, or factory service. Asking prices run from about $350 to $900, set by factory name and finish level. Public detail on which workshops build this model is thin, and sellers rename factories from season to season.
What the genuine watch is
Lange launched the Zeitwerk Date in 2019 in white gold. Caliber L043.8 winds by hand and holds a 72-hour power reserve. The hour and minute digits jump rather than sweep. A ring of numerals sits at the case edge, and a red marker points to the current date. A corrector button on the case side advances the ring. Retail sits well above $80,000, and the model sells in small numbers.
What the copy gets
- Dial layout: two apertures, outer date ring, printed minute track.
- Case profile and lug shape, machined from 316L or 904L steel.
- Sapphire crystal, sapphire caseback, signed crown and buckle.
- Serial and reference engraving on the caseback rim.
Where the copy fails
- Jump action. The genuine minute digit advances once per minute under constant force. Replica digit modules run off a cam and a modified base caliber, so the jump can lag, double-step, or stall near the top of the hour.
- Date ring. Printed numerals drift against the aperture. Check alignment at the 3, 6, and 9 positions.
- Height. A date and digit module adds stack. Replica cases measure thicker than the genuine case.
- Finishing. Genuine bridges carry hand engraving. Copies show stamped or laser-etched plates.
- Power reserve. Expect 38 to 42 hours from a clone base, not 72.
Inspection checklist
- Ask for a video of the minute change at 12:00, filmed without cuts.
- Ask for photos of the date ring at three different dates.
- Request a timegrapher photo with rate and amplitude.
- Confirm the caseback engraving matches the reference the seller quotes.
- Weigh the watch. A module watch reads heavy for its size.
Legal note for US buyers
US law treats trafficking in counterfeit goods as a federal crime under 18 U.S.C. § 2320. Customs and Border Protection seizes counterfeit shipments at ports and can destroy them. A buyer in the US carries risk of seizure and loss of payment. Authentic Lange watches ship with papers, a service history, and factory support. Copies ship with neither.