Yes, it is the Saxonia Annual Calendar
Yes it is. This is still my favorite Lange (since I have one and not the 1815 Chrono or Datograph).
Saxonia Annual Calendar
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1815 Moon Phase - Unforgettable Masterpieces
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....
...but I am even more interested in the watch in the background. Annual Calendar? If I do buy a Lange that would probably be the one.