Since 2010, the 1815 CHRONOGRAPH has been a paragon of classic design combined with advanced technology. With its Arabic numerals and railway-track minute scale, the dial recalls the charisma of A. Lange & Söhne’s coveted pocket watches. Paying tribute to the 200th birthday of Ferdinand Adolph Lange, who transformed Saxony into a centre of precision watchmaking in the 19th century, the eminent manufactory now presents a special edition of the chronograph.

In addition to deep-blue printed dial elements, the argenté-coloured face in solid silver features a pulsometer scale at its periphery. It is used for heart-rate measurements. This is done by stopping the time while counting 30 heartbeats. Then, on the pulsometer scale, the chronograph sweep-seconds hand provides a direct reading of the number of beats per minute. The hands reflect the colour combination of the dial: hours and minutes are indicated with rhodiumed-gold hands. The chronograph sweep-seconds, minute counter and subsidiary seconds hands are made of blued steel.

The L951.5 chronograph calibre is controlled by a column wheel, equipped with a snail for the precisely jumping minute counter and features a convenient flyback function. It has a power reserve of 60 hours. A large balance wheel with eccentric poising weights driven by a freely oscillating hairspring crafted in-house assures excellent rate accuracy.