The A. Lange & Sohne Lange 1 Moonphase has such highly prcised and refined movement that the moonphase counter realistically imitates the moon's orbit with its constant motion. This is not easily achieved compared to other moonphase mens watches where the movement clicks into position once or twice a day.

Its ability to be accurate is fascinating as well. Its accrued error is just one day in 122.6 days of non-stop operation. The ability for such precision is due to strict calculation of the four-wheel train transmission ratio.

There are three versions of the Lange 1 Moonphase with different types of case but with a silver dial. The cases are pink-gold, yellow-gold, and platinum.

The case is about 38.5mm in diameter with 10.4mm thickness. The sapphire crystal has anti-reflection treatment. The caseback is transparent with sapphire crystal showing off the movement and mechanism within.

Similarly as Lange 1, there is the off-centered hour and minute counter at 9 which has gold markers, printed minute markers, and uses Roman numerals for 3, 6, 9, and 12.

There is also the patented outsized date with gold bordered double window that uses twin-disc mechanism to display the two numbers for the date.

The main difference is the small seconds counter at 5 of Lange 1 has been replaced with a moonphase counter for this range. It still has the power reserve located at 3.

The straps used are crocodile leather and they are hand-stitched to provide high quality fastening of the leather. Its strap buckle is in similar metal piece as the case chosen. There is also a choice of fold-over clasp for the buckle upon request.

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