Since its revival in 1994, A. Lange & Söhne has established a reputation for approaching traditional complications with remarkable technical ambition and mechanical ingenuity. The Richard Lange collection, named in honour of Ferdinand Adolph Lange's eldest son, draws inspiration from the precision instruments and scientific timepieces that helped establish Saxony as a centre of German watchmaking. Introduced in 2014, the Richard Lange Perpetual Calendar Terraluna represents one of the manufacture's most ambitious creations, combining a highly sophisticated perpetual calendar with a constant-force mechanism, an extraordinary 14-day power reserve and a patented orbital moon-phase display. Rather than simply reproducing the familiar appearance of the moon in a conventional aperture, the Terraluna takes a fundamentally different approach, illustrating the relationship between the Earth, moon and sun through an intricate mechanical display.

The ref. 180.026FE is housed in an imposing 45.5mm case crafted from 18K white gold, with a thickness of 16.5mm reflecting the considerable complexity within. Its argenté dial features an unusual regulator-style arrangement, with a large central minute display accompanied by separate indications for the hours and seconds. The perpetual calendar incorporates an outsize date, day of the week, month and leap-year indication, while a discreet power-reserve display tracks the movement's remarkable 336-hour autonomy. Turning the watch over reveals its most extraordinary feature: an orbital moon-phase display integrated into the manually wound calibre L096.1. Comprising 787 individual components, the movement reproduces the moon's position and phases as observed from the northern hemisphere, with a theoretical accuracy requiring correction by just one day every 1,058 years. The result is an exceptional demonstration of A. Lange & Söhne's ability to combine astronomical complications with the traditions of precision German watchmaking.

Watch is in overall like-new condition. The 18K white gold case shows only light signs of wear. The dial and hands are like new. The 18K white gold deployant clasp shows light surface scuffs. Comes with box, warranty, booklet, document holder, loupe, setting tool and cloth.

Please Note: Due to CITES considerations, if the watch is to be shipped outside of the USA, the exotic skin strap will have to be removed.

The Terraluna is an extraordinary expression of A. Lange & Söhne's technical ambition, combining a perpetual calendar, constant-force mechanism and 14-day power reserve with a remarkable astronomical display. Its orbital moon-phase complication makes it one of the manufacture's most distinctive modern creations.