This SIHH 2014 Richard Lange Perpetual Calendar "Terraluna" wristwatch from A. Lange & Söhne features a striking rhodium solid silver dial with hours displayed in a Roman numeral subdial at 5 o'clock, minutes displayed in a subdial at 7 o'clock and seconds displayed in a subdial at 12 o'clock. Date is displayed at 12 o'clock, day-of-the-week at 8 o'clock, month at 4 o'clock, sectorial power reserve indicator at 2 o'clock, and leap year indicator at 6 o'clock. The transparent case back of the watch is truly innovative and displays moon phases and indicates day/night. The complicated watch uses a brown crocodile leather strap with a tang clasp.

Technical details
Model: RICHARD LANGE PERPETUAL CALENDAR “Terraluna”

Movement
Lange manufacture calibre L096.1, manually wound; crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted in five positions; twin mainspring barrel; constant-force escapement with remontoir spring produced in-house; three-quarter plate made of untreated German silver; balance cock engraved by hand

Movement parts: 787
Jewels: 80
Screwed gold chatons : 1
Escapement: Lever escapement
Oscillator: Shock-resistant screw balance and superior-quality balance spring  manufactured in-house, frequency 21,600 semi-oscillations per  hour, precision beat adjustment system with lateral setscrew and  whiplash spring
Power reserve: 14 days (336 hours) when fully wound

Movement dimensions
Diameter: 37.3 millimetres; height: 11.1 millimetres

Functions
Time indicated in hours, minutes, and seconds; perpetual calendar  with outsize date, day of week, month, and leap year; power reserve indicator; orbital moon-phase display with day/night  indication on the movement side

Operating elements
Crown for winding the watch and setting the time; push piece for advancing all calendar displays; recessed push pieces for separate correction of month, day of week, and moon phase

Case, dial & strap
Case: Pink Gold (180.0320 or White Gold (180.026)
Diameter: 45.5 millimetres, height: 16.5 millimetres
Dial: Solid silver, argenté
Hands: Pink Gold (180.032) or Blued Steel (180.026)
Strap: Hand stitched crocodile strap, reddish brown (180.032) or black (180.026)
Buckle: Lange Deployant buckle in solid pink gold (180.032) or white gold (180.026)
Crystal and back: Sapphire crystal (hardness 9)

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