Rose Gold and a deep Blue dial give the 1815 Up/Down 244.037 a combination the model had never worn before 2026. A. Lange & Söhne unveiled it at the Concours of Elegance at Hampton Court Palace in early September 2026, alongside a White Gold twin, and made each version in an edition of 300 numbered pieces. Both reduce the case to 37.5 mm, stepping back from the 39 mm diameter the Up/Down had used since 2013 toward the smaller proportions of the pocket watches that shaped the 1815's design. The indicator that gives the watch its name is marked AUF and AB, German for up and down, and traces back to 1879, when A. Lange & Söhne received a patent for a pocket-watch mechanism that let the owner see whether the movement was wound. In the Rose Gold edition, the warm glow of the case, the Rose Gold hands and a reddish-brown strap frame the cool Blue dial, giving the watch a contrast of temperatures that the Silver-dialled Up/Down models never had, and a character that sits somewhere between the traditional and the contemporary.
The case is 37.5 mm across and 8.7 mm thick, finished with a concave, brightly polished bezel and horizontally brushed flanks. Its lugs are attached to the case and turn sharply down toward the wrist, and the fluted crown gives a secure grip when the watch is wound each morning. On the dial, a silver base finished in Blue surrounds a recessed centre, the detail that has distinguished the 1815 Up/Down dial since its 2013 revival. White pad-printed Arabic numerals, a white railway-track minute scale and small dots at the hours, tripled at each quarter, trace the outer zone, reproducing the graphic language of nineteenth-century Lange pocket watches. In the lower half, two silver-coloured subdials with a snailed finish balance each other. The one on the left shows the state of wind between AUF and AB, with a black segmented scale and two red segments that warn when the mainspring is almost exhausted. The one on the right, at 4 o'clock, counts the running seconds. Blued steel hands serve both subdials, and lancet-shaped hands in Rose Gold indicate the hours and minutes, catching the warmth of the case against the deep Blue. A reddish-brown alligator strap and Rose Gold prong buckle complete the palette.
The mechanism behind the indicator is a good example of Lange's preference for elegant engineering. Earlier state-of-wind displays of the eighteenth and nineteenth centuries were often bulky and delicate, relying on stacks of additional gears. The solution patented by Richard and Emil Lange in 1879 used a compact differential to compare the winding of the mainspring with its unwinding as the watch ran, allowing a pocket watch to stay slim. The hand-wound movement of the 244.037 uses the same principle with a planetary gear system built into the movement itself, which keeps the case to 8.7 mm. As the crown is turned, the hand climbs toward AUF; over the following three days it descends toward AB as the energy is used. With 72 hours of running time, the watch can be left for a long weekend without stopping. The movement comprises 245 parts and is finished in the Lange manner, with Glashütte ribbing on its German silver three-quarter plate, solarised winding wheels, seven gold chatons secured by blued screws and a hand-engraved balance cock. It has a stop-seconds function and, like every Lange movement, is assembled twice before it leaves Glashütte.
The Up/Down has accompanied the 1815 family since its early years. A first version in a 35.9 mm case remained in the collection until 2008, and after a pause of five years Lange revived the model with a 39 mm case, a three-day movement and the recessed dial centre, producing it in three gold colours with Silver dials. The AUF/AB indication is now a Lange signature that appears across the collection, but the 1815 Up/Down remains its most direct and classical expression. By returning to 37.5 mm in 2026, Lange responded to the same appetite for compact dress watches that produced the 34 mm 1815 in 2025, and by choosing Blue for the dial, it gave the model a colour previously associated with limited editions and with the smaller 1815. The choice of the Concours of Elegance for the launch reflected Lange's long association with classic car events, where craftsmanship and heritage are judged side by side. The Rose Gold 244.037 is the warmer of the pair, the version in which case, hands and strap all share one tone.
The 244.037 speaks to collectors who value warmth in a dress watch but want something less predictable than a Silver dial in Rose Gold. The contrast of the Blue dial with the gold case and hands is striking without being loud, and the 37.5 mm case wears comfortably on a wide range of wrists, particularly those that find 39 mm slightly generous. With 300 numbered pieces, it is scarcer than the regular Up/Down while remaining a watch meant to be worn often, wound by hand and read at a glance. It appeals to collectors who appreciate the story behind a complication, since the AUF/AB indication links directly to the work of the founder's sons in the nineteenth century, and to those who enjoy the discreet pleasure of a hand-finished movement seen through the caseback. Alongside a Datograph or a Lange 1, it offers a quieter, more classical side of the manufacture; on its own, it is a complete expression of what the 1815 family stands for, with an added touch of colour.
