From the A. Lange & Sohne website: 1815 MOON PHASE On the occasion of Emil Lange’s 150th birthday in 1999 and to pay tribute to his horological accomplishments, his watchmaking descendants crafted this masterpiece as a symbolic monument in his honour. The moon-phase display is so precise that it
Here is a pic of my ALS marine chronometer. The first Lange that I owned. You can see the 1815 design of arabic numerals and railway-track seconds scale. Interestingly, the Auf/Ab scale is reverse to the modern iteration of this complication.