On Halloween we showed you one of the more unusual watches from A. Lange & Söhne, the Grand Lange 1 Lumen. Today we have a more subtle take on the Grand Lange 1, the new Moon Phase. It starts with the same basic structure as the other members of the Lange 1 family, but adds a beautiful moonphase indicator to the center of the main dial. It’s not just good looking though – this moonphase is accurate for over 100 years without needing any adjustments.

As you would expect from Lange, this watch is much more than a Grand Lange 1 with a moonphase indictor thrown in for good measure. The movement utilizes the hour-train to keep the moonphase wheel in constant slow motion with a seven gear train. This allows the moonphase to be tuned very precisely, which is how the accuracy of one day in every 122.6 years is achieved – that’s 99.9978% accurate if you’re keeping track at home. Just in case you need to make adjustments though, this can be easily done with the pusher between 7 and 8 o’clock.