Back in September 2017, we were the first to bring you news about A. Lange & Söhne’s sixth Handwerskunst model, the 1815 Rattrapante Perpetual Calendar Handwerkskunst. The watch was in Dubai recently and we got a more hands-on look on at the model.

This is the sixth Handwerkskunst model

For the sixth Handwerkskunst edition, the brand has turned its attention to a watch that created a stir when it was first unveiled at SIHH 2013 – the 1815 Rattrapante Perpetual Calendar, a watch that combines two classical complications – a split-seconds chronograph and a perpetual calendar – that are among the most technically challenging in watchmaking today. When first launched in 2013, it won the Grand Prix d’Horlogerie de Genève (GPHG) prize for best Grand Complication and also the Public’s Choice Award that year.

And what happens when a complicated timepiece like this gets the Handwerkskunst treatment? The 1815 Rattrapante Perpetual Calendar Handwerkskunst edition sees artistic decoration of the movement, dial and case. The models in the 1815 family evoke memories of Lange’s historic pocket watches. Consequently, one of the main characteristics of this new Handwerkskunst is a relief engraved and enameled hinged cuvettte 18k white gold case, which lends a very classic touch to this model.

The dial combines enamel art and engraving

This is the first Handwerkskunst model to combine enamel art and engraving on its dial. The solid white gold dial features a deep-blue enamel coat beneath which appear the sculpted contours of the relief-engraved stars almost like a visual extension of the moon-phase display. All models in the 1815 line have Arabic numerals on the dial and here they are flush with the enamel of the dial. Rhodium-plated white-gold hands indicate the time as well as the calendar indications and are also seen on the power-reserve indicator.

The moon-phase display sits at 6 o’ clock, the blue lunar disc of the moon phase echoes the blue of the enamel dial and is also matched by the blued-steel minute-counter hand. In stark contrast to all this blue sit the four recessed subdials in silvered white gold. The chronograph hands are made from gold-plated steel and the dial is framed by a silver-colored flange ring with a traditional railway-track minute scale.

The hinged cuvette case is inspired by historic pocket watches

This timepiece is the first Handwerkskunst edition to feature a hinged cuvette case. This is in the style of pocket watches with hunter cases - spring hinged lids that covered the dial and movement of the watch. The sapphire crystal caseback is protected by a hinged cuvette that depicts Luna – the ancient Roman embodiment of the moon.

The Goddess - presented in relief and tremblage engraving – is seen with a billowing veil, a torch and a crescent moon diadem on her head. The medallion is surrounded by a raised star and cloud relief in blue enamel.

Caliber L.101.1 is made up of 631 parts

Presented in a 41.9 mm white gold case with a thickness of 15.8 mm, this is marginally heftier than the stock version (14.7 mm) thanks to the hinged cuvette. Not exactly a shrinking violet on your wrist, but given the horological heft it carries, the size of the case is understandable. What's amazing about this piece is that despite cramming in the complications and that hinged cuvette case, the watch is still a very wearable timepiece.

This timepiece is powered by the Caliber L101.1 seen on the stock Rattrapante Perpetual Calendar, but the finissage on the Handwerkskunst edition is at another level. Apart from the characteristic Lange flourishes like finely chamfered edges, blued screws and gold chatons; the German-silver train bridge is finished with a granular texture seen 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 echo the stellar motif of the dial.

All in: chamfered edges, blued screws, tremblage engaving

The 631-part hand-cranked movement has a power reserve of 42 hours and beats at 3 Hz (21,600 vph). Lange designs and creates its movements in-house and even makes its own balance springs. With the exception of cases and dials – the maison prefers to leave these to experts – it manages everything else in-house. This watch is a limited edition of just 20 pieces and the edition number is engraved on the case. It is worn on a blue-grey alligator leather strap secured with a white-gold deployant buckle.