Tourbillon A watch equipped with an intricate rotating carriage containing the balance wheel in the middle adjacent to the escapement. The carriage rotates about its axis once a minute. It compensates for the effect of the earth's gravity and improves the accuracy of the watch.

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".

Fusee-and-chain transmission An original, early drive system in a spring-powered watch. It assures that the going train is driven with the same moment, or torque, regardless of the state of wind of the spring barrel. It improves the accuracy of the watch.

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.

Emil Lange presented this | tourbillon at the 1900 World Exposition in Paris to which he was invited as a member of the jury. Ninety years later, the watch was acquired at auction for a price of DM 1.5 million. - German silver movement with | fusee-and-chain transmission, screwed | gold chatons, engraved tourbillon carriage cock, compensation balance with gold screws, escape wheel in gold - Enamel dial with | UP-and-DOWN indication and small seconds. Signature: A. Lange & Söhne, Glashütte b. Dresden - Yellow gold case with platinum plating, dust cover with "1900" symbol - Dial cover with miniature enamel painting: Minerva, the laurel-wreathed Roman goddess of handicrafts, holding an olive branch next to a globe, with a view of the city of Dresden in the background