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).

Five-minute clock The famous digital clock (hours = Roman numerals; minutes = Arabic numerals; 5-minute time interval) in Dresden's Semper Opera. It was built in 1841 by Friedrich Gutkaes and Adolph Lange, and is conveniently legible from all seats in the house.

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.

Twin mainspring barrels Two barrels in tandem. Lange's twin mainspring barrels allow the implementation of a progressive power-reserve indication and deliver a power reserve of at least three days.

UP-and-DOWN display The UP-and-DOWN display indicates the state of wind of the mainspring. It reminds the owner that the movement must be rewound again before it stops. It is also called "power-reserve indicator".

Crocodile leather A popular term for alligator skin. Lange uses only crocodile leather from breeding farms that comply with legislation governing species-compatible animal husbandry.

Sapphire crystal Glass made of artificially produced sapphire. It is very hard (9 on the Mohs scale) and scratch-resistant. It ranks just below the diamond in these two respects.

The LANGE 1 is a mechanical wristwatch without peer or precedent. It was introduced as the first Lange watch of the new era and horologically represents a culmination of what aficionados and connoisseurs of fine watches associate with the great "A. Lange & Söhne" heritage. In its heart beats the spiritual legacy of the historic pocket watches built by Lange. With its patented | outsize date, however, it also aptly demonstrates how tradition and ingenuity can come together in style. This useful display, like the | five-minute digital clock in Dresden's Semper Opera that inspired it, improves the legibility of the date by about three orders of magnitude in comparison with conventional timepieces. The solid-silver dial, with its characteristic off-centre displays, indicates the hours, minutes, and seconds. Depending on the model, the hands are made of gold or | blued steel. The | UP-and-DOWN scale provides information on the state of wind of the | twin mainspring barrels which, when fully wound, offers a power reserve of three days. The LANGE 1 comes in 18-carat gold or platinum with a hand-stitched | crocodile strap or, as an option, with an exquisite precious-metal bracelet. The matching gold or platinum clasp is engraved with the Lange signature; the embossed winding crown is solid gold. The | sapphire-crystal caseback affords a mesmerising view of the unique Lange L901.0 movement.