Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsChoose the 1815 Chronograph if you want the slimmer, smaller case and a traditional instrument-style dial; choose the Datograph Up/Down if you prefer its larger display, outsize date and power-reserve indicator. In this comparison, the Datograph is reference 405.028 and the 1815 is reference 402.026: both are manually wound flyback chronographs with a stated 60-hour power reserve, but they wear and present information differently.
At a glance: the two references compared
| Specification | Datograph Up/Down 405.028 | 1815 Chronograph 402.026 |
|---|---|---|
| Case material | 18-carat white gold | White gold |
| Case diameter | 41 mm | 39.5 mm |
| Case height | 13.1 mm | 10.8 mm |
| Movement | Manually wound L951.6; 451 parts | Manually wound L951.5; 306 parts |
| Stated power reserve | 60 hours | 60 hours |
| Beat rate | 18,000 semi-oscillations per hour (2.5 Hz) | Not stated on the reference page |
| Water resistance | 3 bar | 3 bar |
| Dial | Blue; outsize date and power-reserve indicator | Argenté; railway minute track and pulsometer scale |
| Collection status | Limited edition of 125; price upon request | Manufacturer identifies this reference as outside the current collection |
Specifications are reference-specific: the Datograph figures are for 405.028, while the 1815 figures are for 402.026. They should not be treated as dimensions or availability statements for every watch in either line. See the manufacturer’s Datograph 405.028 specifications and 1815 402.026 specifications.
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Which case will suit you better?
Pick the 1815 for a thinner, more compact profile
At 39.5 mm across and 10.8 mm high, the cited 1815 reference is 1.5 mm narrower and 2.3 mm thinner than the Datograph. Those differences make it the more compact specification on paper and the likelier fit if you are prioritizing a lower profile under a cuff.
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Pick the Datograph if you want a larger presence
The Datograph 405.028 measures 41 mm across and 13.1 mm high. It occupies more vertical and horizontal space, a trade-off for the larger, more information-rich display. Dimensions alone cannot establish how either watch will feel on your wrist; try the exact reference if possible.
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How do the dials differ?
Datograph: prominent date and balanced chronograph layout
The Datograph places its outsize date above two subdials. Small seconds sit at 9 o’clock and the jumping chronograph minute counter at 3. The blue dial combines these indications with a power-reserve display, making the watch’s layout more feature-dense.
1815: traditional timing-instrument cues
The argenté 1815 dial uses two slightly recessed subdials, a railway-style minute track, fifth-second graduations and a pulsometer scale. Its design emphasizes elapsed-time reading and a classical instrument aesthetic rather than a large date or reserve indicator. A pulsometer scale is a dial feature; its presence does not by itself establish a medical function or certification.
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What do the chronograph functions and movements offer?
Both references are manual-wind flyback chronographs
Each watch has a flyback function, allowing the user to reset a running chronograph and start another timing interval without first stopping it. A. Lange & Söhne describes the 1815 operation as resetting to zero during a running measurement and beginning the next timing operation when the pusher is released. The manufacturer describes the Datograph’s flyback as stopping, resetting and restarting with one pusher actuation.
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The L951.6 has 451 parts, beats at 18,000 semi-oscillations per hour (2.5 Hz), and is stated to provide 60 hours of power reserve. The Datograph also lists an outsize date, a power-reserve indicator and a precisely jumping minute counter. According to the manufacturer, the minute counter advances as the chronograph seconds hand completes its 60th second.
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1815 L951.5
The L951.5 has 306 parts and a stated 60-hour reserve. Its reference page lists the manually wound chronograph movement but does not state a beat rate there; no beat-rate comparison is implied by the figures available for these references.
What do edition size and collection status mean for buying?
Datograph Up/Down 405.028
The manufacturer lists this white-gold, blue-dial reference as a limited edition of 125 pieces and gives its price as upon request. The edition size is not a measure of current stock, resale value or typical transaction price. For the manufacturer’s product details, see the Datograph Up/Down page.
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1815 Chronograph 402.026
The manufacturer labels reference 402.026 as outside its current collection. That status does not establish whether an individual example is available from a retailer or on the secondary market. Check the precise reference and assess condition, provenance and current seller information before making a purchase.
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Which one should you choose?
- Choose the 1815 Chronograph 402.026 if the smaller, thinner case and railway-track, pulsometer-led dial are your priorities.
- Choose the Datograph Up/Down 405.028 if you want the larger case, outsize date, power-reserve indicator and jumping minute counter.
- Try both exact references if fit is decisive. The stated dimensions show the difference in footprint, but not how either case will sit on your wrist.
The official specifications do not establish real-world accuracy, long-term service costs, wrist-specific comfort, resale value or current market availability. Treat those as separate questions to verify for the particular watch and seller.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
