A Lange & Sohne released a special watch known as the 1815 Rattrapante Perpetual Calendar Handwerkskunst. This will produced in a very limited quantity of 20 pieces. The dial and the hinged cuvette of this new Lange consist of blue enamelled white gold with elaborate relief engravings. Ennobled with special decorative techniques, the movement stands out with the rare and fascinating combination of a split-seconds chronograph and a perpetual calendar with a moonphase display.
What makes this watch intersting is that This is the first model to combine enamel art and engraving on its dial. Solid white gold is the substrate for the deep-blue enamel beneath which the sculpted contours of the relief- engraved stars appear to be a visual extension of the moon-phase display. The Arabic numerals are flush with the enamel and harmonise perfectly with the rhodiumed white- gold hands of the time and calendar indications as well as of the power-reserve indicator. The colour of the enamel is echoed by the lunar disc as well as the blued-steel minute- counter hand. These elements contrast exquisitely with the four recessed subsidiary dials in argenté-colored white gold.
Artistic movement decorations reflect the technically ambitious multiple-complication timepiece. The German-silver train bridge is finished with a granular texture often found in the movements of historic pocket watches. Relief and tremblage engravings on the operating-lever, cover and chronograph bridges as well as on the rattrapante and balance cocks reflect the stellar motif of the dial. In all other respects, the finissage of the 631-part manufacture calibre L101.1 complies with the strictest Lange standards. The split-seconds chronograph allows the measurement of lap times and consecutive times. It is controlled by two column wheels one for the chronograph and one for the readily visible rattrapante mechanism which is activated by a pusher at 10 o’clock. The perpetual calendar mechanism correctly displays the individual durations of each month in the course of a calendar year, including all leap years until 2100. Integrated in the subsidiary seconds dial at 6 o’clock, the moon-phase display is calibrated to remain accurate for 122.6 years. The manually wound movement has a maximum power reserve of 42 hours. A power-reserve indicator reminds the owner when it is time to rewind the watch.
So lets get to the details of the watch now shall we?
The case is 18kt white gold, measures 42mm x 15.8mm. It has double sapphire crystals. Hinged cuvette in blue enamelled white gold with relief and tremblage engraving. The movement is the German manual-wind Lange in-house caliber L101.1 with 43 jewels (with 4 screwed gold chatons) , 21,600 vph and a power reserve of 42 hours. It is crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted to five positions; plates and bridges made of untreated German silver; train bridge with granular surface; operating-lever, cover and chronograph bridges as well as rattrapante and balance cocks engraved by hand with tremblage technique. It is comprised of 631 parts. Lever escapement. Shock-resistant screw balance, balance spring manufactured in-house; precision beat-adjustment system with lateral setscrew and whiplash spring.
The functions include: hours, minutes and subsidiary seconds; split- seconds chronograph with minute counter; perpetual calendar with date, day of week, month, moon phase and leap year; and power- reserve indicator.
It has a six-part, blue enamelled white gold dial with relief engraving; argenté- colored flange ring with railway-track minute scale. Rhodiumed gold hands; chronograph hand: gold-plated steel; rattrapante hand: rhodiumed steel, minute-counter hand: blued steel.
It comes fitted on a hand-stitched blue gray alligator leather strap with grey seam and an 18kt white gold deplolyant buckle. Not only is this a very technical watch but it’s also a very stunning piece to look at and admire.