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The new A. Lange & Söhne DATOGRAPH UP/ DOWN “Lu­men” re­li­ably tells the time around the clock

HK Golfer - - Contents - By The Ed­i­tors

THE NEW A. LANGE & SÖHNE DATOGRAPH UP/ DOWN “LU­MEN” RE­LI­ABLY TELLS THE TIME AROUND THE CLOCK, AND ITS STOP FUNC­TION CAN BE USED AT ANY TIME AS WELL. THIS IS BE­CAUSE ALL IN­DI­CA­TIONS ARE LEGIBLE EVEN IN DARK­NESS, THANKS TO ITS SEMI-TRANS­PAR­ENT DIAL AND LU­MI­NOUS DIS­PLAYS. THE CHRONOGRAPH – WITH A FLYBACK FUNC­TION, A PRE­CISELY JUMP­ING MINUTE COUNTER AND A POWER-RE­SERVE IN­DI­CA­TOR – COMES IN A LIM­ITED EDI­TION OF 200 WATCHES.

What strikes the eye at first sight of the DATOGRAPH UP/DOWN is its vi­brant and yet har­mo­niously bal­anced dial de­sign. The char­ac­ter­is­tic out­size-date dis­play in the framed dou­ble aper­ture marks the tip of an equi­lat­eral tri­an­gle. Its base­line is de­fined by the two sub­sidiary di­als for the sec­onds and the pre­cisely jump­ing minute counter. In the DATOGRAPH UP/ DOWN “Lu­men”, the in­ge­nious con­fig­u­ra­tion un­folds a new aes­thetic di­men­sion as soon as dark­ness sets in.

This is achieved with a semi-trans­par­ent dial and a lu­mi­nous com­pound that causes all dis­plays to glow in the dark­ness - with a dis­tinc­tive green hue that the hu­man eye per­ceives as par­tic­u­larly pleas­ant. The hour and minute hands are filled with the lu­mi­nous ma­te­rial; the chronograph sweep sec­onds hand is fully coated with the com­pound. The sec­onds hand and minute counter in blued steel re­volve above sub­sidiary di­als that are noc­tilu­cent, too. The cir­cum­fer­en­tial dial ring with the minute scale that is sub­di­vided into fifth-of-a-sec­ond grad­u­a­tions, the con­cen­tric tachome­ter scale and the power-re­serve ar­row ap­plique also glow in green.

But the real stun­ner is the lu­mi­nous out­size date. Com­posed of two sep­a­rate dis­play el­e­ments, the out­size date is de­signed to glow im­me­di­ately af­ter the mid­night switch­ing se­quence as well. This is made pos­si­ble with a lu­mi­nous ten cross and a black printed units disc made of trans­par­ent glass which ro­tates above a lu­mi­nous back­ground. Both el­e­ments must be able to recharge dur­ing the day when they are po­si­tioned be­neath the dial. This is en­abled by the semi-trans­par­ent dial; even dur­ing the day, it en­dows the watch with inim­itable aes­thetic ap­peal. Its coat­ing not only as­sures crisp leg­i­bil­ity in day­light but also al­lows the lu­mi­nous com­pound on the tens cross to be recharged. When ex­posed to light, the out­size date mech­a­nism is clearly vis­i­ble. Thus, the switch­ing ac­tion of the date dis­play at mid­night can be ob­served in de­tail in am­bi­ent light.

The DATOGRAPH UP/DOWN “Lu­men” is the fourth model of the “Lu­men” se­ries that A. Lange & Söhne launched in 2010. A spe­cial coat­ing on the semi-trans­par­ent sap­phire-crys­tal dial fil­ters out most of the vis­i­ble light, but not that part of the UV spec­trum which is needed to charge the lu­mi­nous pig­ments with light en­ergy. The darker the sur­round­ings, the more clearly the dis­plays con­trast against the dark back­ground.

In 1999, A. Lange & Söhne de­fined new bench­marks in chronograph de­sign with the DATOGRAPH. Its flyback func­tion al­lows con­sec­u­tive mea­sure­ments: an on­go­ing mea­sure­ment can be in­ter­rupted and a new one started in­stan­ta­neously with a sin­gle touch of the but­ton at 4 o’clock. This

“In 1999, A. Lange & Söhne de­fined new bench­marks in chronograph de­sign with the DATOGRAPH. Its flyback func­tion al­lows con­sec­u­tive mea­sure­ments: an on­go­ing mea­sure­ment can be in­ter­rupted and a new one started in­stan­ta­neously with a sin­gle touch of the but­ton at 4 o’clock.”

rare func­tion saves time be­cause the flyback mech­a­nism ex­e­cutes the three nor­mally nec­es­sary stop, re­set and restart steps with only one touch of a but­ton.

The pre­cisely jump­ing minute counter of the chronograph ad­vances by one marker ex­actly when the chronograph sweep sec­onds hand passes the 60th sec­ond, even if the time mea­sure­ment is stopped at that very mo­ment. This elab­o­rate tech­nol­ogy sim­pli­fies the doubt-free read­ing of stopped times. Launched in 2012 as a sys­tem­atic re­fine­ment of the clas­sic col­umn-wheel chronograph, the DATOGRAPH UP/DOWN also in­di­cates how much of the 60-hour power re­serve re­mains avail­able. This in­for­ma­tion is pro­vided by the power-re­serve in­di­ca­tor at 6 o’clock. When the small ar­row enters the red zone of the dis­play, it is time to pro­vide the move­ment with fresh en­ergy.

The sap­phire-crys­tal case­back ex­poses the im­pres­sive beauty of the lav­ishly fin­ished 454-part man­u­ally wound cal­i­bre L951.7 of the DATOGRAPH UP/DOWN “Lu­men”. Lange’s pro­pri­etary cam-poised bal­ance wheel, paired with a freely os­cil­lat­ing Lange hair­spring, beats at a fre­quency of 18,000 semi-os­cil­la­tions per hour (2.5 hertz). In com­bi­na­tion with the 300-marker minute scale, this al­lows time mea­sure­ments with a res­o­lu­tion of one-fifth of a sec­ond. The new model, avail­able in a lim­ited edi­tion of just 200 watches, comes in a 41-mil­lime­tre plat­inum case. It is worn on a black al­li­ga­tor leather strap with a plat­inum prong buckle.

The A. Lange & Söhne DATOGRAPH UP/DOWN “Lu­men”

The DATOGRAPH UP/ DOWN “Lu­men” is the fourth model of the “Lu­men” se­ries that A. Lange & Söhne launched in 2010

The real stun­ner is the lu­mi­nousout­size date

The lav­ishly fin­ished 454part man­u­ally wound cal­i­breL951.7

Lange’s pro­pri­etary cam-poised bal­ance wheel, paired with a freely os­cil­lat­ing Lange hair­spring, beats at a fre­quency of 18,000 semi-os­cil­la­tions per hour (2.5 hertz)

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