LANGE 1 TOURBILLON PERPETUAL CALENDAR

Movement

Lange manufacture calibre L082.1; self-winding, decorated and assembled by hand; precision-adjusted in five positions;plates and bridges made of untreated German silver; central element of the unidirectional winding rotor in 21-carat gold with platinum centrifugal mass; intermediate-wheel and tourbillon cocks engraved by hand

Movement parts

624

Jewels

76,including one diamond endstone

Screwed gold chatons

6, including one diamond endstone

Escapement

Lever escapement

Oscillator

Shock-resistant balance with eccentric poising weights; balance spring manufactured in-house with a frequency of 21,600 semi-oscillations per hour

Power reserve

50 hours when fully wound

Functions

Time indicated in hours, minutes and subsidiary seconds;tourbillon with patented stop-seconds mechanism; perpetual calendar with outsize date, day of week, month and leap year; day/night indicator; moon-phase display

Operating elements

Crown for winding the watch and setting the time; recessed push pieces for advancing all calendar displays or separately correcting the month, day of week and moon Phase

Case dimensions

Diameter: 41.9 millimetres; height: 12.2 millimetres

Movement dimensions

Diameter: 34.1 millimetres; height: 7.8 millimetres

Crystal and back

Sapphire crystal (Mohs hardness 9)

Case

White gold

Dial

Solid silver, grey

Hands

Rhodiumed gold

Strap

Hand-stitched alligator leather strap, black

Buckle

Lange deployant buckle in white gold