A. Lange & Sohne,145,Accutron,1,AkriviA,11,Alain Silberstein,4,alarm,18,Alpina,19,Andersen Geneve,2,Andersmann,2,Andreas Strehler,5,Angelus,6,annual calendar,44,Anonimo,15,Anthony de Haas,2,Antiquorum,4,Antoine Martin,2,Antoine Preziuso,1,Apple,2,Apple Watch,2,Aquadive,2,Aquastar,1,Armin Strom,80,Arnold and Son,27,Artime,1,Astarwatch,1,Atelier de Chronometrie,1,Ateliers deMonaco,2,Atmos,1,Auctions,94,Audemars Piguet,97,Autodromo,1,automaton,2,BA111OD,1,Ball Watch,1,Bamford,2,Baselword 2022,1,Baselworld,8,BaselWorld 2013,50,BaselWorld 2014,53,Baselworld 2015,69,Baselworld 2016,27,Baselworld 2017,64,Baselworld 2018,75,Baselworld 2019,41,Baselworld 2020,2,Baume,4,Baume & Mercier,18,Baume et Mercier,72,Beaubleu,1,Bell & Ross,41,Berneron,1,Bernhard Lederer,5,Bernhard Zwinz,1,bespoke,1,Blancpain,100,blue dial,3,Bonhams,2,Bovet,14,Brands histories,1,Breguet,131,Breitling,74,Bremont,1,Bremont Watch Company,4,Breva,2,bronze,28,Bücherei,1,Bucherer,1,Bulgari,121,Bulova,2,Burberry,1,C3H5N3O9,1,carbon,4,carillon,4,Carl F. Bucherer,4,Carl Suchy,1,Carrera,20,Cartier,49,ceramic,23,Certina,13,Chanel,5,Chaumet,3,chiming hour,15,Chopard,42,Christiaan van der Klaauw,2,Christie's,9,Christophe Claret,5,Christopher Ward,15,chronograph,787,chronometer,42,Chronoswiss,6,Cimier,1,Citizen,6,co-axial,1,column-wheel,9,complete calendar,29,complications,91,concept watch,5,Concord,1,constant-force,39,Corum,18,Credor,2,CSEM,1,Cuervo y Sobrinos,1,Cyrus,36,Czapek,8,Dan Niederer,1,Davosa,1,Daytona,8,De Bethune,30,de Grisogono,3,dead seconds,21,Delma,2,detent escapement,4,DeWitt,9,digital display,1,dive watches,96,diving,8,diving watches,415,double regulator,3,Doxa,40,drei,1,dress watches,540,dual time,107,Ebel,2,Eberhard,35,Edouard Koehn,7,Edox,6,El Primero,42,Emile Chouriet,1,Emmanuel Bouchet,1,Emmanuel Breguet,1,enamel dial,14,enamelling,16,Equation of time,10,ETA,1,Eterna,18,exhibitions,1,F.P.Journe,40,Faberge,2,factory tours,3,Favre-Leuba,1,feature article,92,features,127,Felipe Pikullik,2,Ferdinand Berthoud,8,flyback,64,Fondation de la Haute Horlogerie,1,Formex,1,Fortis,9,Franc Vila Founder,1,Franck Muller,8,Frederic Jouvenot,1,Frederique Constant,21,Furlan Marri,1,FVF,1,Gallet,1,Garrick,1,Geneva Watchmaking Grand Prix,8,Georg Jensen,1,George Daniels,4,Gerald Charles,2,Gerald Genta,13,Girard-Perregaux,48,Glashuette,19,Glashuette Original,94,Glashütte,33,Glashütte Original,127,Glycine,4,GMT,140,GoS,1,GoS Watches,1,GPHG,23,GPHG 2020,3,GPHG 2021,3,GPHG 2022,3,GPHG 2023,3,GPHG 2024,3,GPHG2019,1,Graham,6,Grand Feu,7,Grand Prix d’Horlogerie de Geneve,17,Grand Seiko,36,Grande Complication,28,Grande Sonnerie,9,Greubel Forsey,40,greubelforsey,1,Grøne,1,Gronefeld,10,Grönefeld,8,Grossmann,3,guilloché,8,H. Moser and Cie,51,H20 Watch,1,Habring,10,Habring2,11,Hajime Asaoka,2,Hallmark of Geneva,2,Hamilton,38,hands-on,135,Hanhart,21,Harry Winston,11,Hautlence,6,Hermes,26,Heuer,2,high jewellery,2,high-frequency,5,Hublot,66,Hybris Artistica,1,Hydro Mechanical Horologists,7,HYT Watches,16,Icon,1,In pictures,18,independent watchmaker,39,industry news,245,interview,9,Interviews,9,IWC,175,Jacques Bianchi,1,Jaeger-LeCoultre,130,Jaquet Droz,58,Jean-Francois Mojon,1,Jean-Marc Pontroué,1,JeanRichard,3,jumping hours,38,Junghans,12,Kaj Korpela,1,Kari Voutilainen,11,Kazuo Maeda,1,Kenissi,1,Kollokium,1,Korpela,1,Krayon,4,Kudoke,6,Kurono,2,L.Leroy,1,L'Epee 1839,2,Labails,1,Ladies watches,198,Lang & Heyne,4,Lang 1943,1,Lange,54,large date,3,Laurent Ferrier,26,Laureus,2,Le Garde Temps,1,Lederer Watches,5,Leica,3,Lemania,1,Leroy,4,Linde Werdelin,2,Longines,103,Louis Erard,34,Louis Moinet,8,Louis Vuitton,3,luxury steel watch,30,LVMH,10,LVMH 2020,6,M.A.D.Edition,5,M.A.D.Editions,5,Maîtres du Temps,1,Manufacture Contemporaine du Temps,3,Manufacture Royale,3,Marc Lang,1,marine chronometer,2,Marqueterie,1,Maurice de Mauriac,2,Maurice Lacroix,27,MB&F,72,MCT,1,MeisterSinger,99,meteorite,3,metiers d'art,3,Mickey Mouse,2,Mido,67,military watches,14,Minerva,4,Ming,2,Minute Repeater,62,monopusher chronograph,5,Montblanc,58,moon phases,134,Moritz Grossmann,31,Moser,46,Muhle,6,Mühle-Glashütte,5,mystery watches,4,Nautilus,14,New Britain Corp,1,new watches,3855,Nivada,3,Nomos,82,Norqain,32,Ochs und Junior,6,Officine Panerai,109,Omega,202,Only Watch,15,Only Watch 2015,4,Only Watch 2017,2,Only Watch 2019,3,Only Watch 2021,4,Only Watch 2023,10,Oris,44,paillonne,1,Panerai,112,Parmigiani,17,Parmigiani Fleurier,36,Pascal Coyon,1,Patek,62,Patek Philippe,139,Pedrozo & Piriz,1,perpetual calendar,154,Perrelet,12,Petermann Bedat,3,Phenomen,1,Philippe Dufour,1,Phillips,10,Piaget,41,Pierre DeRoche,2,pilot,1,pilot watch,115,Pininfarina,1,Pisa,17,Pisa 1940,5,Pisa Circle,13,Pita,1,planetarium,3,platinum,8,pocket watch,4,pocket watches,2,Poehlmann-Bresan,2,Poincon de Geneve,2,Porsche Design,17,Pre-SIHH 2016: Cartier - Clé de Cartier Automatic Skeleton,1,pulsometer,5,Purnell,1,quartz,11,Rado,20,Ralf Tech,3,Ralph Lauren,2,rattrapante,26,Raul Pages,2,Raymond Weil,5,rectangular watches,16,reddot award,1,regatta,3,regulator,30,remontoire,5,Remy Cools,1,Renaud Tixier,1,Reservoir,2,resonance,22,Ressence,13,retrograde,10,Revelation,1,Reverso,27,review,137,RGM,1,RGM Watch Co.,1,Richard Mille,118,Richemont,4,Richmond,1,Roger Dubuis,12,Roger Smith,1,Roger W. Smith,1,Rolex,72,Romain Gauthier,13,Romain Jerome,1,Royal Oak,40,Rudis Sylva,1,sapphire,4,Schwarz Etienne,1,Seamaster,10,Seiko,41,SevenFriday,26,SIHH,3,SIHH 2012,4,SIHH 2013,25,SIHH 2014,36,SIHH 2015,43,SIHH 2016,44,SIHH 2017,41,SIHH 2018,43,SIHH 2019,53,Simon Brette,2,Singer,7,Singer Reimagined,11,single hand,33,single-hand watches,40,Sinn,16,skeleton,36,smartwatch,9,solar energy,1,Sotheby's,8,Speake Marin,6,Speake-Marin,6,Speedmaster,38,split seconds,27,sport,1,sport watches,1001,sportwatches,1,Spring Drive,3,square watches,4,squelette,61,steampunk,1,Steinhart,1,Strehler,1,striking time,16,SuisseMecanica,1,sunrise,2,sunset,2,Swatch,9,Swatch Group,24,Sylvain Pinaud,2,table clocks,4,Tag Heuer,186,tantalum,1,technical insight,3,terra Cielo Mare,1,Theo Auffret,1,tides,1,Tiffany,17,Tissot,10,titanium,12,top news,457,Torsti Laine,1,tourbillon,387,Trilobe,4,Tudor,40,Tulloch,1,Tutima,3,ultra thin,36,Ulysse Nardin,40,Unimatic,1,Union Glashutte,15,Universal Genève,1,Urban Jurgensen,29,Urwerk,22,Vacheron Constantin,83,Van Cleef & Arpels,7,Vauchier Fleurier,1,Vianney Halter,5,video,1,vintage watches,3,Vulcain,11,wandering hours,1,watches,1,Watches & Wonders,42,Watches & Wonders 2020,19,Watches & Wonders 2021,28,Watches & Wonders 2022,35,Watches & Wonders 2023,38,Watches & Wonders 2024,47,Watches & Wonders 2025,2,Watches&Wonders,10,WatchesandWonders2022,35,WatchesandWonders2023,39,WatchesandWonders2024,48,WatchesandWonders2025,2,Wilhelm Schmid,1,Winnerl,1,worldtime,60,YEMA,5,Zannetti,1,Zeitwerk,2,Zeitwinkel,1,Zenith,114,Zodiac,9,
In this new model of the 1815 product line, an additional blued-steel hand at 8 o’clock indicates how long the watch will continue to run before having to be rewound. The display with AUF for the fully wound and AB for the fully unwound movement is a traditional A. Lange & Söhne characteristic that dates back to a patent granted in 1879. 
The principle employed in the 1815 Up/Down also relies on a patent filed by Otto Lange, one of the grandsons of the manufactory’s founder. His invention was specially conceived for slender watches: a planetary gear system integrated in the movement drives the display without requiring extra vertical space. Lange adopted the same approach for the power-reserve indicator of the 1815 Up/Down On the plate side, two additional gold chatons in the three-quarter plate made of silver refer to the presence of the power-reserve mechanism.
Despite the supplementary 57 parts, the L051.2 movement has exactly the same dimensions as that of the 1815 without the Up/Down indicator: a height of 4.6 millimetres and a diameter of 30.6 millimetres. Beneath the hand-engraved balance cock, a classic screw balance and an indexless oscillator assure optimised rate accuracy together with a balance spring developed and manufactured in-house, which is calibrated to a frequency of 21,600 semi-oscillations per hour.
The 39 mm case of the 1815 Up/Down is crafted from 18-carat yellow, white, or pink gold; all model variations have an argenté dial made of solid silver. Black numerals and blued-steel hands guarantee perfect legibility.
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