At the close of the anniversary year that commemorates the 200th birthday of Ferdinand Adolph Lange, this paragon of precision timekeeping is being presented in a limited Handwerkskunst edition featuring extraordinary dial and movement decorations.
Handwerkskunst, the German word for “artisanship”, is an attribute of distinction that A. Lange & Söhne has been using since 2011 to identify special limited-edition watches whose dials and movements are endowed with rare finissage and engraving techniques.
The main difference versus the model presented in 2014 is the dial. It is made of black-rhodiumed rose gold and decorated with tremblage engraving. The engraver who uses this technique sculpts the material with a specially crafted lining burin to achieve a uniform, fine granular structure. The relief elements on the dial, including the prominent arced brand logo and the numerals, are later polished to a mirror gloss and contrast prominently against the dark background. An aperture in the dial reveals the large one-minute tourbillon. The tourbillon bridge and the upper part of the cage are black-polished: this is one of the most elaborate and time-consuming finissage techniques.
Technical Specifications: Ref. 730.048F
The case, in 18kt rose gold, measures 39.5mm x 11.1mm. It has double sapphire crystals and it is water resistant to 30 meters.
Movement is the German hand-wind Lange in-house caliber L102.1, with 21 jewels, includiong one diamond endstone and 5 screwed gold chatons, 21,600 vph and a power reserve of 72 hours. It is decorated and assembled by hand; precision-adjusted to five positions; plates and bridges made of untreated German silver; three-quarter plate with granular surface and hand-engraved inscriptions; seconds bridge engraved by hand.
It features a lever escapement, a shock-resistant screw balance, and a balance spring manufactured in-house. Functions are: hours, minutes, and subsidiary seconds; one-minute tourbillon with patented stop seconds and patented Zero-Reset mechanism.
It comes on a reddish-brown hand-stitched alligator leather strap with an 18kt rose gold deployant.