The best replica Datograph Up/Down is a hand wound build with a live AUF/AB power reserve arc and subdials sitting at the correct 4 and 8 o'clock positions. That is the version most wholesale buyers should ask for first. Everything below is judged against three criteria: whether the power reserve indicator actually moves with the mainspring, whether the subdial layout matches the original, and whether the case stays near the 41 mm by 13.1 mm profile of reference 405.031. Nail those three and the watch reads as a Lange from arm's length. Miss them and no amount of decoration on the movement will save it.
What Up/Down Means, and Why It Complicates the Copy
A. Lange & Söhne built the Datograph Up/Down around an arc marked AUF and AB that wraps the small seconds subdial, plus a day and night indicator and a 60 hour power reserve. The original Datograph from 1999 ran a shorter reserve and had no such display. That single added feature is the hardest part of the replica to fake, because a reserve hand that never moves is obvious the moment a buyer winds the watch and waits.
The genuine watch is hand wound, with the chronograph driven by a column wheel and a jumping minute counter. Replica makers have two routes: strip an automatic chronograph movement to make it hand wound, or build on a manual wind chronograph base. The first route is cheaper and usually thicker. The second is closer to the original in feel and is the one worth paying for.
Top Pick: Hand Wound Build With a Working Reserve Arc
This is the build I would lead with for anyone who wants the watch to behave like the original. The crown winds with resistance, the reserve hand creeps from AB toward AUF as you wind, and the chronograph pushers have a distinct start and stop without mush. Case thickness should land between 13 and 14 mm, and the caseback should show a hand engraved balance cock with a swan neck regulator.
Pros
- Reserve indicator tracks winding, so the Up/Down feature is functional rather than painted on
- Correct 4 and 8 o'clock subdial spacing with the outsize date at 12
- Thinner case profile that slides under a cuff
- Manual wind keeps the caseback view clean, with no rotor blocking the movement
Cons
- Higher cost than automatic based versions
- Fewer sellers stock it, so lead times run longer
- Manual wind needs daily attention, which some buyers dislike
Best for: collectors who already own replicas and want the one piece in the box that fools a knowledgeable friend at dinner. Pair it with a dark strap and it works for evening wear.
Second Pick: Automatic Based Build
Most wholesale stock uses an automatic chronograph base with a module to move the subdials into place. It is the practical choice if you want to wear the watch hard, swim adjacent, and not think about winding it. The trade off shows up in two places: case thickness creeping past 14.5 mm, and a reserve hand that either sits still or sweeps on a fixed schedule.
Pros
- Lower price and wide availability
- Automatic winding suits daily wear and travel
- Service and replacement parts are easier to source
Cons
- Fake or non functional power reserve display on most examples
- Thicker case that sits high on the wrist
- Rotor visible through the back, which the original never has
Best for: a first Lange style purchase, a beater rotation, or a gift where the dial matters more than the movement.
Inspection Checklist Before You Commit
- Measure the case. The original is 41 mm wide and 13.1 mm thick. Anything past 15 mm is a tell.
- Wind it 20 turns and watch the reserve hand. It should move toward AUF and stay there.
- Check the outsize date. Both digits must sit on one plane with no gap in the middle and no misaligned font weight.
- Look at the subdial hands. The minute counter should jump in one minute steps, not sweep.
- Press the pushers. Start, stop, and reset should each feel distinct, with no grind on reset.
- Check the metal. Reference 405.031 is platinum and 405.032 is pink gold. A steel case is lighter and brighter than either, so know what you are buying.
- Confirm lug width at 20 mm and that the strap sits flush against the case with no gap.
Which Build Fits Which Buyer
If you wear a watch five days a week and take it off at night, the hand wound build rewards you and the reserve arc becomes a daily ritual. If you travel, swap watches often, or want one piece to cover the office and the weekend, the automatic version is the lower risk purchase. If you are buying for a wholesale case to resell, stock both: the top tier build as the headline piece and the automatic as the volume seller. Buyers who ask about the AUF and AB markings are the ones who will pay for the hand wound version, and that question is the fastest way to sort a serious customer from a casual one.
Common Questions
Does the power reserve actually work? On the top tier hand wound build, yes. On most automatic based builds, no. Ask the seller to send a video of the reserve hand moving before you pay.
Is the caseback engraving a fair test? It is one of the better ones. Hand engraved balance cocks vary in depth and pattern. Laser etching looks flat and repeats the same swirl on every unit.
What strap belongs on it? A hand stitched alligator in dark brown or black with a matching pin buckle. The original ships on a Lange buckle, so check the buckle shape before assuming it matches.