A. Lange & Söhne Datograph Watches

The Watch That Philippe Dufour Called "The Best"

In 2000, A. Lange & Söhne released the Datograph — a flyback chronograph with an outsize date, a symmetric dial, and a movement of such extraordinary hand-finishing that the legendary independent watchmaker Philippe Dufour was filmed examining one at Baselworld and declaring it the best chronograph in the world. The Datograph (caliber L951.1) was the first chronograph from any manufacture to combine a flyback mechanism, a precise jumping minute counter, and the Lange outsize date in a single movement — and every surface of that movement was finished to a level that exceeded what most manufactures reserved for their grand complications. The German silver three-quarter plate was decorated with Glashütte ribbing (the Saxon equivalent of Côtes de Genève). The balance cock was hand-engraved. The swan-neck regulator was polished to a mirror finish. The chronograph levers were beveled and polished by hand. The Datograph was not just a new chronograph — it was a new standard for what a chronograph movement should look like.

What Makes the Datograph Movement Different

Every chronograph movement uses a set of levers and springs to control the start/stop/reset functions. In a cam-lever chronograph (the most common type, used in the Valjoux 7750 and its derivatives), these components are stamped from flat metal and functionally shaped — they work, but they are not beautiful. In a column-wheel chronograph (used by Patek, Rolex, and others), a rotating column wheel coordinates the lever actions — more precise, but the wheel itself is a small, hidden component. The Datograph uses a column-wheel, but its levers are not merely functional — they are sculpted. Each lever is hand-finished with interior angles, beveled edges, and polished surfaces that catch light like jewelry. The result is a movement where the chronograph mechanism is not just an engineering solution but an aesthetic achievement — the most beautiful chronograph architecture in production.

The Datograph Lineup

Datograph (Ref. 403.035 — Original) The icon. 39mm platinum case with caliber L951.1 (flyback chronograph, outsize date, 36-hour power reserve). The original Datograph is the watch that Philippe Dufour praised — the one that established the standard. The 39mm case is compact by modern chronograph standards, but the dial proportions are perfect: the subdials, the outsize date, and the Roman numerals create a composition that no redesign has improved upon. Discontinued but available on the secondary market.

Datograph Up/Down (Ref. 405.035 / 405.032) The evolution. 41mm platinum or pink gold case with caliber L951.6 (flyback chronograph, outsize date, power reserve indicator, 60-hour power reserve). The Up/Down addressed the two criticisms of the original: the 36-hour power reserve (increased to 60 hours) and the 39mm case size (increased to 41mm). The power reserve indicator at 6 o'clock adds a functional complication without disrupting the dial symmetry. The Up/Down is the Datograph for daily wear — the one that combines the original's aesthetic with modern convenience.

Datograph Perpetual (Ref. 410.032 / 410.038) The grand complication. 41mm pink gold or white gold case with caliber L952.1 — a flyback chronograph with outsize date, perpetual calendar, and moonphase. The Perpetual is the most complicated Datograph and one of the most impressive watches in the entire A. Lange & Söhne catalog. The perpetual calendar is mechanically programmed to correctly display the date, day, month, and leap year cycle until 2100 without adjustment. Produced in very small quantities.

Pre-Owned Pricing Guide

Frequently Asked Questions

Q: Datograph or 1815 Chronograph?
A: The Datograph has the outsize date, a larger case (41mm vs. 39.5mm), and a more complex movement architecture. The 1815 Chronograph has no date, a smaller case, and a more classically proportioned dial. The Datograph is the statement piece — the one that connoisseurs recognize. The 1815 is the purist's piece — the one that traditionalists prefer. Both use column-wheel, flyback chronograph manufacture movements. Choose based on whether you want the outsize date (Datograph) or maximum dial purity (1815).

Q: Original 39mm or Up/Down 41mm?
A: The original 39mm is the collector's choice — the case that Philippe Dufour examined, the proportions that defined the Datograph. The Up/Down 41mm is the daily-wear choice — more power reserve, more wrist presence, and a power reserve indicator. If you are buying for collectibility and historical significance, original. If you are buying to wear every day, Up/Down.

Q: Why is the Datograph so expensive?
A: Because the movement finishing is at the highest level in the industry — every lever, spring, and bridge is hand-finished with interior angles and polished bevels that no machine can produce. The Datograph is not just a chronograph; it is a demonstration that serial production and hand-finishing are not mutually exclusive. The price reflects the labor required to achieve this standard.

Sell or Trade Your Datograph

Our specialists provide transparent valuations for every Datograph reference. We understand the nuances: model generation (original vs. Up/Down vs. Perpetual), case metal (platinum commands a premium), dial variant, and the presence of the original box, certificate, and all documentation. Walk into our 47th Street showroom for an immediate appraisal, or use our fully insured Parcel Pro shipping label for a remote evaluation with same-day payment.

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