German silver Special alloy composed of copper and zinc, with a nickel concentration of about 10%. German silver is stronger than brass and has been traditionally used by Lange for the manufacture of plates and bridges. The addition of nickel minimises the oxidation of German silver and thus eliminates the need to electroplate the alloy - it can remain "untreated".

Glashütte ribbing A linear decoration. It is produced by a rotating grinding wheel that is slightly inclined and moved along the surface of the workpiece in parallel lines.

Blued steel, blued screws Steel parts are slowly and cautiously heated (annealed) to about 300°C. This process coats the metal with an extremely thin, shimmering film of cornflower-blue magnetite (Fe3O4).

Chamfering Also: angling, bevelling. The breaking and polishing of sharp edges on bridges and levers. The inclined surface has the same width along its entire circumference or length.

Form movement Technical term for a movement that is not round but instead shaped in the form of the case. Form movements can be rectangular, tonneau-shaped, or arcade-shaped, for example.

Gold chaton The gold setting of a bearing jewel - in Lange watches, chatons are often secured to the three-quarter plate with two or three screws.

Outsize date display Depending on the size of the watch, this useful function makes it possible to display the date up to five times larger than in a conventional watch of similar dimensions. It is based on the patented two-disc mechanism.

Three-quarter plate The three-quarter plate was introduced in Glashütte by Adolph Lange in 1864. Since then, it has been a typical feature of Lange watches. It accommodates the counter-bearings of the going train and enhances the stability of the movement.

Balance cock Small metal plate screwed to the visible side of the movement. It carries the balance wheel shaft bearing.

Adjusted in five positions The watch is timed for accuracy in the positions in which it is most often worn: dial up and down, winding crown up and down, and horizontal.

Screw balance A balance wheel that has adjustable screws and tiny washers along its rim.

Semi-oscillation Also: vibration. Half of the path travelled by the balance wheel from end point to end point.

Whiplash precision index adjuster An adjusting device composed of a steel spring in the shape of a swan's neck, a pointer, and a setscrew. The screw is used to adjust the beat, or the timing, of the watch in very small increments.

Exalted far and wide, the legendary beauty of Saxon women is borne out admirably by the ARKADE. But a closer look at its movement also corroborates that its inner values and technical features are clearly peer to its outgoing personality. The mechanical ensemble of the patented | outsize date is composed of 66 tiny parts. Another unmistakable Lange feature is the | three-quarter plate made of untreated | German silver. It elegantly matches the arcade shape of the case and is decorated with | Glashütte ribbing. The | blued screws and the three screwed | gold chatons are fascinating visual accents. All surfaces of the | form movement are meticulously finished by hand, even those that usually remain concealed to the eye of the beholder. Moreover, the edges are | chamfered and polished. The seconds hand of the manually wound movement stops when the crown is pulled. When fully wound, the watch has a power reserve of 42 hours. The intricate, shock-proofed | screw balance executes 21,600 | semi-oscillations per hour and is adjusted in | five positions. The accuracy of the ARKADE is fine-tuned with the | whiplash precision index adjuster which is screwed to a hand-engraved | balance cock.