The A. Lange & Söhne 1815 UP/DOWN is a manually wound watch with a power-reserve indicator, not a watch this article can honestly describe as personally handled or tested. The current 39 mm references and the 37.5 mm limited 2026 editions share calibre L051.2 and a stated 72-hour reserve. Their dimensions and manufacturer-described details can clarify what you are considering; they cannot establish how a particular watch wears or performs on your wrist.
What “UP/DOWN” means
The display at 8 o’clock indicates the movement’s state of wind: “AUF” means fully wound and “AB” means unwound. It is a power-reserve indicator, positioned opposite the subsidiary-seconds dial. That gives the wearer a visual reminder of how much energy remains in the manually wound movement; it is not a second time display.
A. Lange & Söhne says the indicator is integrated directly into calibre L051.2 by a space-saving planetary gear system, rather than added as a separate module. The brand states that the system allows a movement height of 4.6 mm. These are manufacturer descriptions, not measurements made for this article. A. Lange & Söhne’s 1815 UP/DOWN overview
Current 1815 UP/DOWN references
The current 39 mm models and the 2026 special editions are distinct versions of the family. The specifications below are those published by A. Lange & Söhne; the 2026 editions were announced on 4 September 2026.
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| Reference | Case and dial | Movement and reserve | Other stated details |
|---|---|---|---|
| 234.026 | 39 mm diameter, 8.7 mm height; 18-carat white gold; argenté-coloured dial crafted from 925 silver | Manually wound L051.2; 245 parts; 72-hour stated power reserve | 3 bar water resistance; black alligator strap and white-gold prong buckle. The US page lists it as an online-boutique model. |
| 234.032 | 39 mm diameter, 8.7 mm height; 18-carat pink gold; argenté dial | Manually wound L051.2; 245 parts; 72-hour stated power reserve | 3 bar water resistance; alligator strap and pink-gold prong buckle. |
| 244.028 | 37.5 mm diameter, 8.7 mm height; 18-carat white gold; blue dial | L051.2; 72-hour stated power reserve | Blue alligator strap; 3 bar water resistance; limited to 300 pieces. The UK manufacturer page displays “Price upon request.” |
| 244.037 | 37.5 mm diameter, 8.7 mm height; 18-carat pink gold; blue dial with argenté auxiliary dials | L051.2; 72-hour stated power reserve | Reddish-brown alligator strap; limited to 300 pieces. |
Sources: 234.026 product page, 234.032 product page, and the brand’s 4 September 2026 announcement.
What the size difference establishes—and what it does not
The 2026 references are 1.5 mm narrower than the 39 mm versions, while the stated height is 8.7 mm for both sizes. That is a useful dimensional distinction, but case diameter and height alone do not establish how either version will sit on an individual wrist. The manufacturer describes the 2026 models as new editions to be presented at that year’s Concours of Elegance at Hampton Court Palace; that announcement does not confirm present-day stock or availability.
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Movement and dial details
The manufacturer describes L051.2 as a manually wound calibre assembled twice. Its stated power reserve is 72 hours on the current 39 mm and 37.5 mm models. The brand’s construction descriptions include a three-quarter plate made of untreated German silver, winding wheels with solarisation, gold chatons held by blued screws, a manually engraved balance cock, a classic screw balance, an indexless oscillation system, and an in-house Lange balance spring. These are attributed specifications and design descriptions, not independent inspection findings. Manufacturer overview; 2026 announcement
The brand traces the dial design to historic Lange pocket watches. It describes a railway-track minute scale, Arabic numerals, lancet-shaped hands, and recessed auxiliary dials. On the blue 2026 editions, the release describes argenté auxiliary dials and blued subsidiary-seconds hands against the blue main dial. Whether those elements are especially legible in particular lighting cannot be established from a product description.
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Water resistance, price and availability
The cited current-model pages report 3 bar water resistance. That figure alone does not establish that a particular watch is suitable for swimming, showering or diving; do not infer a water-use recommendation from it.
No numeric current retail price is established by the cited official pages. The UK page for reference 244.028 says “Price upon request.” Price and inventory can vary by market and date, so check with the relevant A. Lange & Söhne boutique or an authorized retailer for current information. A product page or an announced limited-edition quantity is not evidence that a watch remains available.
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Do not confuse it with the older reference 221.032
The archived 221.032 is a materially different, discontinued reference, not another name for the current 39 mm or 2026 37.5 mm watches. A. Lange & Söhne lists it as no longer part of the current collection, with a 35.9 mm pink-gold case, 7.9 mm height, calibre L942.1, 209 parts and a stated 45-hour reserve. Archived 221.032 product page
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What a specification-led account cannot tell you
The published specifications identify the references, dimensions, materials and stated functions, but they do not establish wrist comfort, winding feel, strap behavior, real-world dial legibility or measured timekeeping accuracy. Those questions require handling or testing a specific watch under stated conditions. Without that firsthand evidence, this is a specification-led account rather than a hands-on review.
Quick Recap
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