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SIHH 2013: A. Lange & Söhne - 1815 Up/Down

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Another new watch presented by A. Lange & Söhne at SIHH 2013 is the 1815 Up/Down where 1815 refers to the birth date of Ferdinand A. Lange, the founder of the Saxon manufacture, and Up/Down to the indication of the power reserve.

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 finishes of the calibre  L051.2 tops the highest standards including chamfered and polished edges, Glashütte ribbing on the three-quarter plate, gold chatons secured with blued screws, the polished endpiece of the escape-wheel cock, and winder wheels decorated with solarisation that are visibly integrated in the plate.
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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