A. Lange and Söhne Grand Lange 1 Luna Mundi Set 119.026

Movements:

Lange manufacture calibres L901.7 ("Luna Mundi/ Southern Cross") and L901.8 ("Luna Mundi/Ursa Major"); manually wound; adjusted in five positions; twin mainspring barrels; patented outsize date; power-reserve indicator; plates and bridges made of untreated cross-laminated German silver; balance cock engraved by hand

Number of parts:

398 ("Luna Mundi/Ursa Major")
402 ("Luna Mundi/Southern Cross")

Frequency:

21,600 semi-oscillations per hour

Jewels:

54

Screwed gold chatons:

9

Escapement:

Lever escapement

Balance:

Shock-proofed Glucydur screw balance, Nivarox balance spring, patented micrometer-screw index adjuster with whiplash spring

Power reserve:

More than 72 hours when fully wound

Functions:

Hours, minutes, small seconds with stop seconds, patented outsize date, power-reserve indicator

Features:

Moon-phase display for Northern Hemisphere with clockwise and Southern Hemisphere with anti-clockwise moon disc rotation for correct presentation of visible lunar orbit.

Accuracy of display:

One day deviation from synodic lunation in 122.6 years

Operating elements:

Crown for winding the movement and setting the time, push-piece for switching the patented outsize date, recessed push-piece for correction of the moon-phase display

Case:

Diameter 41.9 millimeters, 18-carat white gold ("Luna Mundi/Ursa Major") and 18-carat pink gold ("Luna Mundi/Southern Cross")

Glass and caseback:

Sapphire crystal (hardness 9)

Dials:

Solid silver, argenté, with rhodiumed- or pink-gold appliqués, depending on model

Hands:

Rhodiumed or pink gold, depending on model

Water resistance:

30 metres

Straps:

Hand-stitched crocodile strap with precious-metal Lange prong buckle in white or pink gold, depending on model

Edition:

Limited to 101 sets (two watches each)