Automatic movement with perpetual calendar; the perpetual calendar mechanism is mounted on the dial side of the calibre. It also includes a solid-gold lunar disc. It is pictured from the dial side.
A. Lange & Söhne
Additional 24 Hour Hand (fixed), Hours, Minutes, Small Seconds
Big Date, Day, Month, Perpetual Calendar, Leap Year
Price: $ 239
The ref. 310.221 Langematik Perpetual Calendar was available from 2001 to 2007. It features both a yellow gold case as well as bracelet.
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A. Lange & Söhne - The new 1815 Chronograph
It was a sensation when it premiered in 1999: with the Datograph, A. Lange & Söhne established an excellent reputation in the topmost league of chronograph-making and then systematically consolidated it with horological milestones such as the Double Split and the Datograph Perpetual. Now, the 1815 Chronograph debuts not only as a notable reinterpretation of a horological classic but also as a top-tier addition to the 1815 watch family that was relaunched just last year. It has a power reserve of 60 hours and a proprietary Lange balance spring. Hardly any other watch manifests the union of tradition and inventiveness as well as of legendary beauty and advanced technology as remarkably as Lange's 1815 Chronograph. The dial reflects the subtle arrangement of indications shared by A. Lange & Söhne's coveted historic pocket watches, of which some 700 were already configured as chronographs. The two symmetrically positioned subsidiary dials for the seconds and 30-minute counter emphasise the balanced geometry and the classic style of the watch. The vintage railway-track scale at the periphery of the dial assures superb legibility of stopped times to one-fifth of a second. The precisely jumping minute counter also simplifies time measurements. The sleek, elegant looks of the watch contrast with the intricacy of the calibre L951.5 chronograph movement with column-wheel control and a stepped pinion for the precisely jumping minute counter. One of the highlights among the numerous technical features is the flyback function, a device found only in very few chronographs. With one single push piece, the 1815 Chronograph can be stopped and reset in the middle of a time measurement. And a new measurement is started as soon as the push piece is released again.
A large mainspring barrel delivers a sizable power reserve of 60 hours. Rate stability is ensured by the large balance wheel with eccentric poising weights. It is powered by a balance spring developed and manufactured in-house and reciprocates with a frequency of 18,000 semi-oscillations per hour.
The sapphire-crystal caseback reveals one of the technically most exquisite and at the same time most beautiful chronograph mechanisms ever made. It showcases most of the technical and artisanal details, including the stepped pinion for the precisely jumping minute counter, the column wheel that controls the chronograph functions, and the precision beat adjustment system with its whiplash spring on the hand-engraved balance cock. This is state-of-the-art chronography at its absolute best.